CN102809601A - Guided wave detection device - Google Patents
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- CN102809601A CN102809601A CN2011104311010A CN201110431101A CN102809601A CN 102809601 A CN102809601 A CN 102809601A CN 2011104311010 A CN2011104311010 A CN 2011104311010A CN 201110431101 A CN201110431101 A CN 201110431101A CN 102809601 A CN102809601 A CN 102809601A
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Abstract
The invention discloses a guided wave detection device. The device comprises a sensor, an ultrahigh-frequency signal transceiver, a signal analysis processor and a display, wherein the sensor is electrically connected with the ultrahigh-frequency signal transceiver and the signal analysis processor through radio frequency cables; the sensor comprises a gradient circular tube, a transition type rectangular tube, a signal output device, an acquired signal input device and sensor interfaces; a mouth of the gradient circular tube finishes the transmission and reception of ultrahigh-frequency guided wave signals; inner cavities of the signal output device and the acquired signal input device are machined to form rectangular waveguides; the ultrahigh-frequency signal transceiver generates and outputs ultrahigh-frequency signals, and sweeps a signal source; the signal analysis processor has the functions of acquiring, converting, storing, processing and inputting/outputting (I/O) electromagnetic guided wave signals; and the display finishes the transmission communication of time-domain reflection signals of a heat transfer tube. The positions of defects are obtained by utilizing the correlation between the propagation and the phase shift amount of guided waves and the defects of the heat transfer tube of a heat exchanger by a time-domain reflection technology; and the positions and depths of the defects can be rapidly determined during practical detection or in-service inspection.
Description
Technical field
The present invention relates to the corrosion and the damage status detection range of steam generator heat-transfer pipe, be specifically related to a kind of guided wave pick-up unit.
Background technology
At present; The device that is used for the inspection of nuclear power station steam generator heat-transfer pipe of generally acknowledging in the world is an eddy current testing instrument; Existence need be eddy current probe that sensor is delivered to tested position in use, no matter adopts interior crossing type or jacket-type sensor, and they all differ from one another because of sensor is different.Its principle is to confirm defective locations or defect size by the difference of electromagnetic eddy field, when in-Service Inspection of Nuclear Power Station, should not be long because be detained at nuclear island, and eddy current sensor uses Robotics to transmit mostly, can't in nuclear island, stay the long time.And guided wave method same service robot that uses when detecting; Because sensor is to be sent to tested position in this device; So the action of robot is as long as move between each U-shaped pipe mouth of pipe of tube sheet exactly; Provide each mouth of pipe to insert function and just can transmit the guided wave signal, and be transferred to the other end of U-shaped pipe with the light velocity in the medium at once, return the emission mouth of pipe through reflector reflects.According to the Time Domain Reflectometry principle, or the anti-correlation of EM theory discusses, and just can find the defective of inside pipe wall and have the position of penetrability pitch corrosion.
The guided wave method is when defect detection, and is higher to the resolution of defective, less than 5% o'clock, also has resolution in corrosion.The guided wave detection method on the basis of former eddy-current method, has improved detection speed, has also improved measurement range and precision relatively.Like this, only under the environmental baseline of inspection nuclear power station key equipment, fast detecting just has the index meaning; To the aerospacecraft liquid-propellant rocket engine pipeline environment of changeable and very difficult expectation, also solved the inspection difficult problem of the pipeline before the pouring liquid propellant.On the basis of the sensor research, the guided wave detector of invention except using when the metal tube manufacturing plant factory inspection and acceptance, can also be applied in the inservice inspection.
This method must be checked in the heat-transfer pipe of evaporator or constitute the objective reality of the pipe that lossy medium fills just with fluid media (medium); Measurement, the defective on whole inside pipe wall face of inspection and the new approaches and the new technology of corrosion condition of utilizing the transmission inverse correlation characteristic presentation of guided wave in heat transfering tube of heat exchanger have been created; But this method is found when attempting to carry out electromagnetism guided wave inspection metal tube: what 1) unlike material comprised that tubular object such as nickel-base alloy, stainless steel and instrument constitute is coaxial waveguide or circular waveguide system, all needs adjustment during practical application.If different bores, the sensor that then instrument depended on must adopt different insertion bores, could carry out effective electromagnetic transmission smoothly, does not reach theory location---all standing of heavy caliber pipe of expection.2) concentric cable is a Unbalanced line, and sensing system is a balanced line, and the two need do balance and nonequilibrium conversion and isolation when transmitting-receiving connects, otherwise produces serious disturbance.3) sensor is promptly popped one's head in and is not made balance and non-equilibrium conversion designs, and balance and non-equilibrium conversion just is impossible, and the serious disturbance signal can flood faint reflected signal fully, makes testing result nonsensical.When the electromagnetic wave that two or three pattern is arranged exists simultaneously, do not utilize polarization separator can't detect the electromagnetic wave signal relevant with defective with the multimode elliptic filter.
Summary of the invention
In view of this; The object of the present invention is to provide a kind of guided wave pick-up unit; Through utilizing the correlativity between leading wave propagation and phase-shift phase thereof and the heat transfering tube of heat exchanger defective; The employing Time Domain Reflectometry is technological, tries to achieve the position of defective, when actual detected application or inservice inspection, can confirm the position and the degree of depth thereof of defective so quickly and easily.
For achieving the above object, technical scheme of the present invention is following:
A kind of guided wave pick-up unit comprises sensor, ultra-high frequency signal transceiver, part signal analysis processor, the portable computer display of mutual electrical connection; Said sensor is electrically connected with said ultra-high frequency signal transceiver and said part signal analysis processor through radio-frequency cable;
Said sensor comprises gradual change pipe, transition type rectangular tube, coupling mechanism trunk and branch, signal output device, acquired signal input unit, sensor interface one and interface two compositions; The conical mouth of pipe of said gradual change pipe is accomplished transmitting and receiving of ultrahigh frequency guided wave signal, and suitable with tested heat-transfer metal mouth of pipe footpath; Said signal output device and acquired signal input unit inner chamber are processed into rectangular waveguide, and in said waveguide cavity, are provided with probe; Said sensor interface one and interface two are electrically connected through cable splice;
Said ultra-high frequency signal transceiver takes place and the output ultra-high frequency signal, and swept signal source;
Said signal analysis and processing device to electromagnetism guided wave signal gather, change, store, processing and I/O function, and digital circuit, mimic channel, signals collecting and change-over circuit, storer etc. are integrated on the module;
Said portable computer display is the display of acquired signal, can accomplish the transmission communication of the otdr signal of heat-transfer pipe, and the power supply of portable power supplies and the demonstration of flaw indication.
Preferably, the conical port of said gradual change pipe is designed to the balanced line formula, and suitable with said transition type rectangular tube bore.
Preferably, be added with the coupling tuning screw on the corresponding wave guide wall of said waveguide cavity.
Preferably, said ultra-high frequency signal transceiver, part signal analysis processor and portable computer display group are contained in the framework, and directly choose corresponding ultra-high frequency signal band limits according to the tested heat-transfer metal mouth of pipe.
Preferably; Said portable computer display is the display of acquired signal; It is integrated cable bus and gathers the exchanges data between single-chip microcomputer and each parameter measurement instrument EBI of bottom, is sent to harbor through interface through optical cable, under the control of main frame, delivers to main frame through wiring control, data acquisition interface; And, send host process through the data acquisition panel with the data of sensor-based system and other peripheral hardware.
Preferably, said pick-up unit also is provided with the control handwheel that is used for the service robot operation.
Can find out from above-mentioned technical scheme; The disclosed a kind of guided wave pick-up unit of the present invention; Through utilizing the ingenious measurement of accomplishing the steam generator heat-transfer pipe inspection of Time Domain Reflectometry technology; When the electromagnetism guided wave is propagated in medium; Its path-waveform will change with the electromagnetic property and the parameter of medium that is passed through or passage, according to the hourage that receives ripple (and two way travel time), amplitude, frequency and wave form varies data, can confirm the situation of medium inherent vice structure and corrosion target thereof etc.According to anti-correlation or anti-(contrary) problem solving of the theoretical model of transmission line, different phase amount and amplitude can demonstrate the defective position and the degree of depth.Also output waveform or figure on request that specific (special) requirements is arranged.When practicality, can carry out the location of defective quickly and easily, confirm depth size effectively and whether run through.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings;
Fig. 1 is the block diagram of the disclosed a kind of guided wave pick-up unit of the embodiment of the invention;
Fig. 2 is the structural representation of the disclosed a kind of guided wave pick-up unit of the embodiment of the invention at the robot control pick-up.
The title of the corresponding component that numeral among the figure or letter are represented:
1, sensor 11, gradual change pipe 12, transition type rectangular tube 13, coupling
Collection signal input unit 17, sensor interface 1, sensor interface two
2, ultra-high frequency signal transceiver 3, part signal analysis processor 4,
7, control handwheel
Embodiment
To combine accompanying drawing below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of protection of the present invention.
The invention discloses a kind of guided wave pick-up unit; Through utilizing the correlativity between leading wave propagation and phase-shift phase thereof and the heat transfering tube of heat exchanger defective; Employing Time Domain Reflectometry technology; Try to achieve the position of defective, when actual detected application or inservice inspection, can confirm the position and the degree of depth thereof of defective so quickly and easily.
Embodiment.
As depicted in figs. 1 and 2, a kind of guided wave pick-up unit comprises sensor 1, ultra-high frequency signal transceiver 2, part signal analysis processor 3, the portable computer display 4 of mutual electrical connection; Said sensor 1 is electrically connected with said part signal analysis processor 3 with said ultra-high frequency signal transceiver 2 through radio-frequency cable;
Said sensor 1 comprises gradual change pipe 11, transition type rectangular tube 12, coupling mechanism trunk 13 and coupler branches 14, signal output device 15, acquired signal input unit 16, sensor interface 1 and sensor interface 2 18 compositions; The conical mouth of pipe of said gradual change pipe 11 is accomplished transmitting and receiving of ultrahigh frequency guided wave signal, and suitable with tested heat-transfer metal pipe 5 bores; Said signal output device 15 is processed into rectangular waveguide with acquired signal input unit 16 inner chambers, and in said waveguide cavity, is provided with probe; Said sensor interface 1 and interface 2 18 are electrically connected through cable splice;
Said ultra-high frequency signal transceiver 2 takes place and the output ultra-high frequency signal, and swept signal source;
3 pairs of electromagnetism guided waves of said signal analysis and processing device signal is gathered, changes, is stored, processing and I/O function, and digital circuit, mimic channel, signals collecting and change-over circuit, storer etc. are integrated on the module;
Said portable computer display 4 is the display of acquired signal, can accomplish the transmission communication of the otdr signal of heat-transfer pipe, and the power supply of portable power supplies and the demonstration of flaw indication.
Wherein, the conical port of said gradual change pipe 11 is designed to the balanced line formula, and suitable with said transition type rectangular tube 12 bores; Be added with the coupling tuning screw on the corresponding wave guide wall of said waveguide cavity; Said ultra-high frequency signal transceiver 2, part signal analysis processor 3 and portable computer display 4 are assembled in the framework, and choose corresponding ultra-high frequency signal band limits according to tested heat-transfer metal pipe 5 bores; Said portable computer display 4 is the display of acquired signal; It is integrated cable bus and gathers the exchanges data between single-chip microcomputer and each parameter measurement instrument EBI of bottom; Be sent to harbor through interface through optical cable; Under the control of main frame, deliver to main frame, and, send host process through the data acquisition panel with the data of sensor-based system and other peripheral hardware through wiring control, data acquisition interface; Because it is long that personnel are difficult in the nuclear island delay, said pick-up unit also is provided with the control handwheel 7 that is used for service robot 6 operations.
The electric wave of propagating in the coaxial cable is a transverse electromagnetic wave.Its direction of an electric field is vertical with coaxial inner conductor; And the direction of an electric field of guided wave in pipe must be vertical with inside pipe wall.When the guided wave signal is excited rectangular waveguide and is changed over to circular waveguide by the coaxial cable interface, according to desired metallic surface field distribution boundary condition, have only vertical component to exist, therefore the electric field in pipe must be parallel with coaxial inner conductor.In like manner, when rectangular waveguide is coupled to the coaxial cable interface, also have only the electric field parallel just can input to coaxial cable with the electric field in the circular waveguide with coaxial inner conductor.Therefore transmit and can not enter into receiving cable and can only be to the transmission of probe side.And, in circular waveguide, can only motivate vertical electric field from the signal that probe receives, get into directional coupler after branch and can not pass to receiving port again, thereby further improved the isolation between the receiving and transmitting signal.Specify that the degree of coupling of directional coupler and isolation need meet design, could satisfy transmitting than receiving the strong requirement of signal.
In the design of carrying out sensor probe, choose signal source through network analyzer and make probe have axial symmetry, can make field distribution have axial symmetry, also be convenient to pop one's head in and play the effect that suppresses parasitic mode when receiving.According to the transient change of each field component, at the z=0 place, the electric field of TE01 mould is stronger between axis and tube wall, near the tube wall a little less than; And the TM01 mould is except that the Ez component, and electric field is stronger near the tube wall.Obviously select the TE01 mould more favourable.In addition; The TE01 mould has only the Hz component in the tangential magnetic field at circular waveguide inwall place, so the wall electric current has only
component.
In a word, this sensor probe is through tight section's mathematical operations and field experiment repeatedly finally finalize the design its mode of operation, signal source frequency of operation and form factors size.
The ultra-high frequency signal transceiver is the essential main utility appliance of apparatus, accomplishes the generation and the output of ultra-high frequency signal, also comprises swept signal source.It is formed in the framework with signal analysis and processing device and display module circuit; According to different calibers, choose the band limits of different ultra-high frequency signals.
The signal analysis and processing device is the core of this apparatus.Because this apparatus, according to anti-correlation or anti-(contrary) problem solving of the theoretical model of transmission line, different phase amount and amplitude can demonstrate the defective position and the degree of depth.Realized the functions such as signals collecting, conversion, storage, processing and I/O of electromagnetism guided wave through this part (unit), digital circuit, mimic channel, signals collecting and change-over circuit, storer etc. have been integrated in realize a systemic-function on the module.The reflected signal of naming a person for a particular job of important here key carries out time-domain analysis.In order to judge the measurement of transmission inverse correlation characteristic presentation, the position of the reflection wave that is shown and depth of defect.
Because the complicacy of electromagnetic wave basic theories, Theoretical Calculation and forward simulation all are based upon on the approximate basis, thus design data, process software, and the suitable special software of development.These theoretical research result and data processing software more help detection limit result's explanation in its application.Along with the further developing and using of the establishment of the anti-correlation of transmission line theory, instrument, data processing technique, can upgrade the renewal version of its software in time through the network interface of this instrument.If other algorithm of conversion, then this apparatus can be widely used in engineerings such as electric power, space flight, chemical industry.
The portable computer display interface device is accomplished transmission communication, the power supply of portable power supplies and the demonstration of flaw indication of the otdr signal of heat-transfer pipe as the display of acquired signal.The technology content of this instrument is very high, a plurality of parameters of once gathering, and the correlativity of each parameter and defective is good, and ageing strong, do not exist multiparameter repeatedly to measure the depth error that is easy to generate, help the accurate explanation of testing result.Integrate cable bus (CBS) technology and compatible its bus protocol.This agreement is meant in the exchanges data agreement of gathering on the instrument bus between single-chip microcomputer and each parameter measurement instrument EBI of bottom.Through interface, deliver to harbor through optical cable, under the control of main frame,, deliver to main frame through wiring control, data acquisition interface, with the data of sensor-based system and other peripheral hardware, send host process simultaneously through the data acquisition panel.
This heat-transfer pipe with the principle of guided wave pick-up unit institute foundation as follows:
Utilize the correlativity between leading wave propagation and phase-shift phase thereof and the heat transfering tube of heat exchanger defective,, try to achieve the position of defective through the Time Domain Reflectometry technology.Under normal circumstances, the leading wave propagation is according to following transmission line theory.
(1) shape of cross section of waveguide and medium characteristic do not change along axis z, promptly have axial homogeneity.
(2) metal waveguide is perfect conductor, i.e. γ=∞.Fill even, linear, isotropic perfect medium in the waveguide.
(3) there is not driving source to exist in the waveguide, i.e. ρ=0 and J=0.
(4) electromagnetic wave is propagated along the z axle, and an intercropping sinusoidal variations at any time.
Under above hypothesis, the electric field component of electromagnetic field and magnetic-field component all satisfy homogeneous wave equation
is wave number in the formula.Since the waveguide axis is along the z direction, no matter how complicated wave propagation situation so is in waveguide, its final effect can only be a guided electromagnetic wave that advances along the z direction.Thereby can be write as waveguide internal electric field component and magnetic-field component
Wherein E (x, y) and H (x y) is function undetermined.γ is the propagation constant of ripple along the z direction.With (1-3) formula substitution equation (1-1) formula,
Here
is horizontal Laplace operator.In the formula
k
c 2＝k
2+γ
2 (1-6)
In like manner
Can by equation (1-5) journey (1-7) to E (x, y) and H (x, y) scalar wave equation of each component.Also can find the solution the wave equation of longitudinal field component earlier, obtain two longitudinal component Ez and Hz, and then try to achieve all cross stream components according to electromagnetic field fundamental equation group.The scalar wave equation that longitudinal field component Ez and Hz satisfy does
Try to achieve Ez and H by above-mentioned two equations
Z0After, can obtain four transverse field components by two vorticity equations from electromagnetic field fundamental equation group
All amounts are only relevant with coordinate x and y in the following formula.
According to above analysis, EHz or Hz component possibly appear in the guided electromagnetic wave of in waveguide, propagating.Therefore, can be according to the situation that exists of Zen and Hz, the guided electromagnetic wave that will in waveguide, propagate is divided into three kinds of wave modes (or pattern): TEM wave mode, TE wave mode and TM wave mode.
Evenly not having the consumption equation for transmission line does
Its separate into
Its parameter does
Get back to the principles of science that the present invention seeks; It is not according to the above-mentioned transmission line theory of generally acknowledging, but be utilized in follow in the classical theory rule ineligible down, " unusually ", " foreign peoples " perhaps appear; Cause according to transmission line theory; " undesired " takes place in electromagnetic transmission, makes unexpectedly to have set up correlativity between phase-shift phase that guided wave is propagated and the heat transfering tube of heat exchanger defective, seeks the feasibility of detection method thus.In other words, anti-(contrary) problem solving to the theoretical model of a transmission line has obtained the new rule that can be suitable for, and has made up theoretical foundation of the present invention thus.That is to say that the present invention is not according to the electromagnetic field of classics or EM theory, but they are in the presentation that does not meet under the assumed condition; Utilize this unusual or abnormality; Solve in the engineering problem how defective that must pay attention to is found by the inservice inspection worker, score a lucky hit in other words conj.or perhaps, made full use of ineligible down; " unusually ", " foreign peoples " that the guided wave transmission occurs, and apply it among the Dynamic Non-Destruction Measurement.Experimental study shows that anti-(contrary) problem solving of obvious this classical transmission line theory model is successful.
For instance, utilize this " unusually " phenomenon, the open circuit of cable, short circuit or not too serious impedance discontinuity under low frequency show one and just are among the cable.These occur in the open circuit of coaxial transmission line, and short circuit or other impedance discontinuities are called as fault.The position of broken end can not use simple ohmmeter to confirm.When high frequency, two-wire or concentric cable are replaced by waveguide.But can use the Time Domain Reflectometry technology to see along the characteristic impedance of whole piece cable.The energy of reflection is the end of a conditional function at cable.According to the formula of critical wavelength λ c=2 π/kc, the critical wavelength result of calculation of guided wave is like table 1:k
The critical wavelength of the relevant leading wave mode of table 1
| E01 | E11 | E21 | E02 | E31 |
| 2.6127a | 1.6398a | 1.2235a | 1.1382a | 0.9848a |
| H11 | H21 | H01 | H31 | H41 |
| 3.4126a | 2.0572a | 1.6398a | 1.4956a | 1.1816a |
For example, steam generator bore 17mm, cutoff wavelength E01 is 22.2mm so; H21 is 17.5mm; E11 is 13.9mm; H01 is 13.9mm; E21 is 10.4mm; H31 is 12.7mm; E02 is 9.67mm; H41 is 10.0mm; E31 is 8.37mm; H11 is 29.0mm.The just the present invention of these result of calculations is in order to design the main foundation of practical sensor.
In addition; The guided wave technology is applied in the inspection and other inspection fields, heat exchanger tube road of the tested heat-transfer metal pipe 5 of nuclear power station key equipment steam generator; Solved eddy current to the limited problem of metal pipe material in the tested heat-transfer metal pipe 5 inspection detections; The tested heat-transfer metal pipe 5 inspection caliber measurement ranges of eddy current steam generator are limited simultaneously, and figure judges that measuring accuracy is poor, it is difficult to differentiate.
Native system has been realized the inspection of the tested heat-transfer metal pipe 5 of steam generator and the phase place and the control of amplitude synchronous detection of uhf electromagnetic wave, and is converted into the technical barrier of standard electric signal output.Made full use of flexible manufacturing technology, theoretical analysis and technology combinations such as design, manufacturing, emulation have been produced sensor 1, just transducer or probe, and determined detecting pattern, corresponding frequencies and entire system; This sensor 1 probe has series of one's own, and the guided wave amplitude that the tested heat-transfer metal pipe 5 of independent completion is correlated with and the detection of phase place do not receive the influence of environmental pressure, temperature and nuclear radiation etc.
Sensor 1 probe has only circular socket to contact with the measured tube medium, and other is all handled with high temperature resistant low temperature, radiation-resistant hermetically-sealed cable and wear-resisting pipe socket, has solved the present situation that can't test under the high radiation environment, 45 ℃ to-25 ℃ of operating temperature ranges; On signal Processing, adopt the application software pattern, make nuclear island detection system and remote data disposal system equity interactive; The sensing net height is imitated communication, has overcome traditional instrument and has gathered sluggish, effective poor; Problems such as data transmission is slow, particularly instrument can online software upgrades; Instrument provides two kinds of patterns on external interface: directly connect output cable pattern and instrument bus pattern; Compatible domestic and international multi-parameter detector device connects the needs that are incorporated into the power networks; Because sensor 1 is service robot manipulation, and sensor bulk is little, and is in light weight, can satisfy that multiple heat exchanger dispatches from the factory and the demand of the detection of inservice inspection, the sensor 1 of different bores can customize by physical size.
In addition; This heat-transfer pipe with the guided wave pick-up unit when tested heat-transfer metal pipe 5 is detected; Do not receive the influence of measured medium and nuclear radiation environment, can expand the measurement range of the caliber of metal tube to 412mm, length is grown to 64m; Measuring accuracy reaches 0.5%, efficiently solves the detection problem at the tested heat-transfer metal pipe 5 of labour.
Heat-transfer pipe uses the technical indicator of guided wave pick-up unit to be:
[1] sensor frequency scope: 45MHz-20GHz;
[3] in the all-wave conduction band is wide, have＜1.25 voltage standing wave ratio (VSWR) performances;
[4] inspection internal diameter of the pipeline 16.9-19.0mm;
[5] when inspection was less than 10 seconds every pipes;
[6] sensor weight is less than 25kg.
Can find out from above-mentioned technical scheme; The disclosed a kind of guided wave pick-up unit of the present invention; Through being used in the ingenious measurement of accomplishing the steam generator heat-transfer pipe inspection of Time Domain Reflectometry technology; When the electromagnetism guided wave is propagated in medium; Its path-waveform will change with the electromagnetic property and the parameter of medium that is passed through or passage, according to the hourage that receives ripple (and two way travel time), amplitude, frequency and wave form varies data, can confirm the situation of medium inherent vice structure and corrosion target thereof etc.According to anti-correlation or anti-(contrary) problem solving of the theoretical model of transmission line, different phase amount and amplitude can demonstrate the defective position and the degree of depth.Also output waveform or figure on request that specific (special) requirements is arranged.When practicality, can carry out the location of defective quickly and easily, confirm depth size effectively and whether run through.
More than be description,, make this area professional and technical personnel can realize or use the present invention through above-mentioned explanation to the disclosed embodiments to a kind of guided wave pick-up unit of the present invention embodiment.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (6)
1. a guided wave pick-up unit is characterized in that, comprises sensor, ultra-high frequency signal transceiver, part signal analysis processor, portable computer display; Said sensor is electrically connected with said ultra-high frequency signal transceiver and said part signal analysis processor through radio-frequency cable;
Said sensor comprises gradual change pipe, transition type rectangular tube, coupling mechanism trunk and branch, signal output device, acquired signal input unit, sensor interface one and interface two compositions; The conical mouth of pipe of said gradual change pipe is accomplished transmitting and receiving of ultrahigh frequency guided wave signal, and suitable with tested heat-transfer metal mouth of pipe footpath; Said signal output device and acquired signal input unit inner chamber are processed into rectangular waveguide, and in said waveguide cavity, are provided with probe; Said sensor interface one and interface two are electrically connected through cable splice;
Said ultra-high frequency signal transceiver takes place and the output ultra-high frequency signal, and swept signal source;
Said signal analysis and processing device to electromagnetism guided wave signal gather, change, store, processing and I/O function, and digital circuit, mimic channel, signals collecting and change-over circuit, storer etc. are integrated on the module;
Said portable computer display is the display of acquired signal, can accomplish the transmission communication of the otdr signal of heat-transfer pipe, and the power supply of portable power supplies and the demonstration of flaw indication.
2. a kind of guided wave pick-up unit according to claim 1 is characterized in that the conical port of said gradual change pipe is designed to the balanced line formula, and suitable with said transition type rectangular tube bore.
3. a kind of guided wave pick-up unit according to claim 1 is characterized in that, is added with the coupling tuning screw on the corresponding wave guide wall of said waveguide cavity.
4. a kind of guided wave pick-up unit according to claim 1; It is characterized in that; Said ultra-high frequency signal transceiver, part signal analysis processor and portable computer display group are contained in the framework, and directly choose corresponding ultra-high frequency signal band limits according to the tested heat-transfer metal mouth of pipe.
5. a kind of guided wave pick-up unit according to claim 1; It is characterized in that said portable computer display is the display of acquired signal, it is integrated cable bus and gathers the exchanges data between single-chip microcomputer and each parameter measurement instrument EBI of bottom; Be sent to harbor through interface through optical cable; Under the control of main frame, deliver to main frame, and, send host process through the data acquisition panel with the data of sensor-based system and other peripheral hardware through wiring control, data acquisition interface.
6. a kind of guided wave pick-up unit according to claim 1 is characterized in that said pick-up unit also is provided with the service robot control handwheel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499591A (en) * | 2013-08-15 | 2014-01-08 | 中广核检测技术有限公司 | Detection method for guided wave of heat-exchanger pipes |
| CN103499635A (en) * | 2013-08-15 | 2014-01-08 | 中广核检测技术有限公司 | Detection technology for guided waves of spiral heat transfer pipes, and sensor thereof |
| CN104569138A (en) * | 2014-12-24 | 2015-04-29 | 苏州华亚电讯设备有限公司 | Guided wave detection device and method for detecting corrosion reduction of pipeline inner walls |
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| CN101566468A (en) * | 2009-04-27 | 2009-10-28 | 安徽华东光电技术研究所 | Pole shoe part detection method used for travelling wave tube |
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| CN103499591A (en) * | 2013-08-15 | 2014-01-08 | 中广核检测技术有限公司 | Detection method for guided wave of heat-exchanger pipes |
| CN103499635A (en) * | 2013-08-15 | 2014-01-08 | 中广核检测技术有限公司 | Detection technology for guided waves of spiral heat transfer pipes, and sensor thereof |
| CN104569138A (en) * | 2014-12-24 | 2015-04-29 | 苏州华亚电讯设备有限公司 | Guided wave detection device and method for detecting corrosion reduction of pipeline inner walls |
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