CN104596945A - Radio frequency (RF) fuel hazard detection device - Google Patents
Radio frequency (RF) fuel hazard detection device Download PDFInfo
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- CN104596945A CN104596945A CN201510052026.5A CN201510052026A CN104596945A CN 104596945 A CN104596945 A CN 104596945A CN 201510052026 A CN201510052026 A CN 201510052026A CN 104596945 A CN104596945 A CN 104596945A
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- spark
- radio frequency
- detection device
- proving installation
- installation pedestal
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Abstract
The invention discloses a radio frequency (RF) fuel hazard detection device which is used for detecting the arc/ spark temperature and image so as to judge whether RF fuel hazard is caused or not. The device comprises a testing device base, an optical fiber spectrometer detector, a light-guide fiber endoscope lens, a light-guide fiber, an optical fiber spectrometer and a nitrogen injection conduit, wherein the testing device base is used for fixing the light-guide fiber endoscope lens and the optical fiber spectrometer detector; the optical fiber spectrometer detector is used for detecting the emission spectrum information of arc/ spark, and calculating the arc/ spark temperature according to the relative intensity of spectrum of a spectral term with the specified wave length; the light-guide fiber endoscope lens is used for acquiring and recording the image information in a fuel tank so as to detect the occurrence of arc/ spark; the nitrogen injection conduit is used for injecting nitrogen into a fuel container so as to guarantee the discharge condition and the test safety. The RF fuel hazard detection device is simple in structure, easy to maintain, convenient in setting and safe to use, and is capable of guaranteeing the accuracy of test data.
Description
Technical field
The present invention relates to a kind of radio frequency fuel oil hazard detection device, particularly relate to the device applying fibre optic endoscopes and spectral analysis technique detection electric arc/spark temperature and image in strong radio frequency environment, belong to technical field of electromagnetic compatibility measurement.
Background technology
The arc ignition that fuel-steam may be brought out by strong radio-frequency field.Fuel vapour is lighted, three conditions below must be possessed, that is: simultaneously
A) for a given environment temperature, fuel vapour and air mixture ratio must be appropriate;
B) enough energy must be had in electric arc and spark, for igniting provides suitable temperature;
C) enough arc gap must be had.When arc gap is too little, the effect of electrode is equivalent to the thermoreceptor producing heat, causes and can not light a fire.
Above-mentioned each condition major part changes with different situations, and simultaneously majority there is one or several to produce the condition of lighting.
Electromagnetic energy makes volatile, inflammable fuel ignition be caused by thermal effect, namely lights and depends primarily on spark energy, but also depends on other many parameters, the composition, temperature, pressure, electrode gap etc. of such as vapour mixture.
At present, conventional method is method of direct observation, is determined the conclusion tested by the state of observing fuel tank.The method does not need other proving installations, simple to operate, is convenient to implement.But, also there are some shortcomings being difficult to overcome in direct method of testing: directly method of testing only can carry out qualitative analysis, its test findings is only effective to test condition, because cannot obtain quantized data, so cannot be assessed the test findings under other conditions by test figure; Because the electric discharge phenomena that may occur cannot be recorded in process of the test, thus cannot Real-Time Monitoring, analysis and record test figure, also cannot be just that system is improved and proposed reference frame.
Summary of the invention
The object of the invention is the deficiency overcoming existing Method and Technology, provide a kind of configure convenience, flexible operation, can the temperature of electric arc/spark and the radio frequency fuel oil hazard detection device of image in measures of quantization record fuel tank.
In order to realize above-mentioned object, the present invention is according to light during electric arc/spark discharge, thermal characteristics design radio frequency fuel oil hazard detection device.Radio frequency fuel oil hazard detection device of the present invention comprises proving installation pedestal, fibre optic endoscopes camera lens, fiber spectrometer detector, light transmitting fiber, fiber spectrometer and nitrogen and injects conduit.
Proving installation pedestal is provided with fiber spectrometer detector and fibre optic endoscopes camera lens, and has nitrogen inject holes.Proving installation pedestal is fixed on simulation lubricator or true nozzle.Fibre optic endoscopes camera lens gathers image in fuel tank and is converted into digitized fiber-optic signal, is sent to computing machine, to detect the generation of electric arc/spark in fuel tank via light transmitting fiber.The light signal of fiber spectrometer detector detected arc/spark, and be sent to fiber spectrometer via light transmitting fiber spectral analysis is carried out to light signal, Spectroscopic analysis results is sent to computing machine.Nitrogen injects conduit by the nitrogen inject holes on proving installation pedestal to nitrogen injection in fuel tank.To prevent from firing dangerous generation; Because use the primary ions line spectrum of nitrogen element to measure the temperature of electric arc/spark, the nitrogen of injection is the breakdown gas producing electric arc/spark, and therefore nitrogen is that detection provides necessary condition
Described proving installation pedestal, also for blocking the luminous energy outside fuel tank, prevents the light signal that the light signal interference arc/spark outside fuel tank produces.Proving installation pedestal is guaranteed the filling spout of lubricator and be there is the discharging gap identical with during actual use between inner wall of oil tank after installing.
Described fibre optic endoscopes camera lens has three, is arranged in the symmetric position on proving installation pedestal, to ensure the detection of electric arc/spark image without dead angle; Each fibre optic endoscopes camera lens is connected to computing machine respectively by a light transmitting fiber.The spectral wavelength ranges of fibre optic endoscopes shot detection is 350 ~ 1100nm.
Described fiber spectrometer detector has four, is arranged in the symmetric position on proving installation pedestal, to ensure the detection of electric arc/spark spectrum without dead angle; Each fiber spectrometer detector is connected with fiber spectrometer by a light transmitting fiber.The spectral wavelength ranges of fiber spectrometer analysis is 200 ~ 2500nm.
The present invention has the following advantages and good effect:
(1) radio frequency fuel oil hazard detection device of the present invention adopts non-contact detection, uses and arranges conveniently;
(2) aim parameter of radio frequency fuel oil hazard detection device detection of the present invention is light signal, not by radio-frequency electromagnetic environmental impact, ensure that the accuracy of test data;
(3) radio frequency fuel oil hazard detection device of the present invention can record the image and temperature that produce electric arc/spark in fuel tank, so can assess the possibility producing fuel oil harm;
(4) radio frequency fuel oil hazard detection apparatus structure of the present invention simple, be easy to safeguard;
(5) radio frequency fuel oil hazard detection device of the present invention can realize Long-distance Control, has security better when testing volatile fuel.
Accompanying drawing explanation
Fig. 1 is the structural representation of radio frequency fuel oil hazard detection device;
Fig. 2 is the embodiment schematic flow sheet of application radio frequency fuel oil hazard detection device;
Fig. 3 is the enforcement schematic diagram of application radio frequency fuel oil hazard detection device;
In figure, each assembly is:
1-proving installation pedestal, 2-fiber spectrometer detector, 3-fibre optic endoscopes camera lens, 4-light transmitting fiber,
5-simulates lubricator, 6-fiber spectrometer, 7-nitrogen inject holes, the injection of 8-nitrogen conduit, 9-fuel tank.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, radio frequency fuel oil hazard detection of the present invention comprises proving installation pedestal 1, fibre optic endoscopes camera lens 2, fiber spectrometer detector 3, light transmitting fiber 4, fiber spectrometer 6 and nitrogen injection conduit 8.
Proving installation pedestal 1 is provided with fibre optic endoscopes camera lens 2 and fiber spectrometer detector 3, also has nitrogen inject holes 7.Proving installation pedestal 1 is fixed on simulation lubricator 5 or true nozzle, for fibre optic endoscopes 2 and fiber spectrometer detector 3 provide fixing and stable test condition.Proving installation pedestal 1 is also for blocking the luminous energy outside fuel tank 9, and the light signal preventing light signal interference arc/spark from producing, affects the accuracy of test data.Proving installation pedestal 1 also can be simulation lubricator 5 and true lubricator provides the necessary condition of generation electric arc/spark, the installation of proving installation pedestal 1 guarantees to there is the discharging gap identical with during actual use between the filling spout of lubricator with fuel tank 9 inwall, and discharging gap index is provided by user usually.Proving installation pedestal 1 leaves nitrogen inject holes 7, during test, inject conduit 8 nitrogen injection by nitrogen.
Fibre optic endoscopes camera lens 2 is provided with multiple, is provided with three in the embodiment of the present invention, is arranged in the symmetric position on proving installation pedestal 1, to ensure the detection of electric arc/spark image without dead angle.Each fibre optic endoscopes camera lens 2 is connected to computing machine by a light transmitting fiber 4.Image in fuel tank 9 is converted into digitized fiber-optic signal by fibre optic endoscopes camera lens 2, and image is sent to Computer display by light transmitting fiber, and image is stored, reproduces, thus realizes the function of record electric arc/spark image.The spectral wavelength ranges that fibre optic endoscopes camera lens 2 detects is 350 ~ 1100nm.
Fiber spectrometer detector 3 is provided with multiple, is provided with four in the embodiment of the present invention, is arranged in the symmetric position on proving installation pedestal, to ensure the detection of electric arc/spark spectrum without dead angle.Each fiber spectrometer detector 3 is connected with fiber spectrometer 6 by a light transmitting fiber 4.Fiber spectrometer detector 3 is for detecting the emission spectrum of electric arc/spark, be sent to fiber spectrometer 6 pairs of light signals via light transmitting fiber 4 and carry out spectral analysis, then data are sent to computing machine, for two spectroscopic temperature measurement method calculating electric arc or spark temperature provide spectroscopic data.The spectral wavelength ranges of fiber spectrometer analysis is 200 ~ 2500nm.
When carrying out radio frequency fuel oil hazard detection, inject conduit 8 to nitrogen injection in fuel tank 9 by nitrogen, one is prevent from firing dangerous generation; Two is that the nitrogen of injection is the breakdown gas producing electric arc/spark, and therefore nitrogen is that detection provides necessary condition because use the primary ions line spectrum of nitrogen element to measure the temperature of electric arc/spark.Computing machine filters out the nitrogen element primary ions line spectrum information of specifying from Spectroscopic analysis results, uses two spectroscopic methodology to calculate the temperature of electric arc/spark.
Simulate lubricator 5 for nozzle during Reality simulation refueling operation, short form test condition and setting.
When carrying out radio frequency fuel oil hazard detection, as shown in Figure 2, first device of the present invention is installed, specifically: fiber spectrometer detector 3 and fibre optic endoscopes camera lens 2 are arranged on proving installation pedestal 1, then proving installation pedestal 1 is fixed on simulation lubricator 5 or true nozzle, light transmitting fiber 4 is used fiber spectrometer detector 3 and fiber spectrometer 6 to be coupled together, use light transmitting fiber 4 fibre optic endoscopes camera lens 2 and testing computer to be coupled together, nitrogen is injected conduit 8 and be fixed on nitrogen inject holes 7.After completing the installment work of proving installation, it is checked, avoid electric leakage or other modes to threaten to fuel container.Then test according to testing requirements, the electric discharge phenomena in monitoring record test.
When generation electric arc/spark being detected by fibre optic endoscopes camera lens 2, fiber spectrometer detector 3 by the optical signal transmission that detects to fiber spectrometer 6, spectral analysis is carried out by fiber spectrometer 6 pairs of light signals, computing machine extracts the nitrogen element primary ions line spectrum information in Spectroscopic analysis results, then two spectroscopic methodology is used to calculate the temperature T of electric arc/spark, by the temperature threshold T that the temperature T of electric arc/spark and radio frequency fuel oil endanger
mcompare, judge whether to produce the harm of radio frequency fuel oil.
Spark ignition mainly because high temperature spark makes neighbouring mixing combustibles temperature raise, so that reaches the critical condition of catching fire and is lighted.Great many of experiments shows, when interelectrode fuel performance, pressure, temperature are certain, only has when discharge energy E is greater than spark ignition least energy E
mintime just can form initial flame.
In formula: T
mmixed gas theoretical temperature combustion, T
∞environment temperature, K
1correction factor, r
minthe minimum radius that catches fire,
thermal capacitance, ρ
∞the density of mixed gas.
The present invention proposes to adopt the temperature of electric arc/spark as criterion, and first the calorific value calculation of based on fuel goes out the temperature threshold T of radio frequency fuel oil harm
m; Then collect the spectral information of electric arc/spark, filter out nitrogen element primary ions line spectrum information wherein, use two spectroscopic methodology to calculate the temperature T of electric arc/spark; Finally, judge whether the temperature T of electric arc/spark reaches the temperature threshold T that the harm of radio frequency fuel oil occurs
mif the temperature T of electric arc/spark does not reach the temperature threshold T that the harm of radio frequency fuel oil occurs
m, the harm of radio frequency fuel oil would not be there is, if the temperature T of electric arc/spark meets or exceeds the temperature threshold T that the harm of radio frequency fuel oil occurs
m, its energy will be more than or equal to E
min, the harm of radio frequency fuel oil will be there is.
The temperature threshold T of radio frequency fuel oil harm
macquisition methods be: suppose two theoretical temperature combustion t
1and t
2, determine corresponding lower calorific value of fuel Q according to formula below
11and Q
12;
Q
1lower calorific value of fuel, V
ithe volume of i-th kind of product,
it is the average specific heat capacity at constant pressure of i-th kind of product.Known Q
1time, respectively by T=t
1and T=t
2substitute into formula above, tabling look-up, it is corresponding to determine
obtain corresponding lower calorific value of fuel Q
11and Q
12;
Then method of interpolation is utilized to obtain temperature threshold T
m,
In the present invention, fiber spectrometer carries out spectral analysis to the light signal that fiber spectrometer detector transmits, and filters out the nitrogen element primary ions line spectrum information of specifying, if selecting wavelength is λ
1spectrum line and wavelength be λ
2spectrum line, use two spectroscopic methodology to calculate the temperature T of electric arc/spark.Can according to the electric arc of formula determination below/spark temperature T:
Wherein,
with
being respectively wavelength is λ
1and λ
2the intensity of spectrum line, A
1 +and A
2 +be respectively wavelength X
1and λ
2the transition probability of spectrum line, g
1 +and g
2 +be respectively wavelength X
1and λ
2the statistical weight of spectrum line excited state, E
1 +and E
2 +be respectively wavelength X
1and λ
2the energy level (excitation potential) of spectrum line excited state.Wavelength X
1and λ
2can be set by user.
Claims (5)
1. a radio frequency fuel oil hazard detection device, for measuring the electric arc/spark temperature and image information that judge whether to there is the harm of radio frequency fuel oil, it is characterized in that: described radio frequency fuel oil hazard detection device comprises proving installation pedestal, fibre optic endoscopes camera lens, fiber spectrometer detector, light transmitting fiber, fiber spectrometer and nitrogen and injects conduit;
Described proving installation pedestal is provided with fiber spectrometer detector and fibre optic endoscopes camera lens, and has nitrogen inject holes, proving installation pedestal is fixed on simulation lubricator or actual nozzle; Described fibre optic endoscopes camera lens gathers image in fuel tank and is converted into digitized fiber-optic signal, is sent to computing machine, to detect the generation of electric arc/spark in fuel tank via light transmitting fiber; The light signal of described fiber spectrometer detector detected arc/spark, and be sent to fiber spectrometer via light transmitting fiber spectral analysis is carried out to light signal, Spectroscopic analysis results is sent to computing machine; Described nitrogen injects conduit by the nitrogen inject holes on proving installation pedestal to nitrogen injection in fuel tank.
2. radio frequency fuel oil hazard detection device according to claim 1, it is characterized in that, the Spectroscopic analysis results that described fiber spectrometer obtains, filters out the nitrogen element primary ions line spectrum information of specifying in Spectroscopic analysis results, uses two spectroscopic methodology to calculate the temperature of electric arc/spark.
3. radio frequency fuel oil hazard detection device according to claim 1, is characterized in that, described proving installation pedestal, and it is guaranteed the filling spout of lubricator and there is the discharging gap identical with during actual use between inner wall of oil tank after installing; Proving installation pedestal, also for blocking the luminous energy outside fuel tank, prevents the light signal that the outer light signal interference arc/spark of fuel tank produces.
4. radio frequency fuel oil hazard detection device according to claim 1, it is characterized in that, described fibre optic endoscopes camera lens has two or more, is arranged in the symmetric position on proving installation pedestal, with can the image information of spark discharge in omnidirectional detection fuel tank.
5. radio frequency fuel oil hazard detection device according to claim 1, it is characterized in that, described fiber spectrometer detector has two or more, is arranged in the symmetric position on proving installation pedestal, with can the spectral information of spark discharge in omnidirectional detection fuel tank.
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|---|---|---|---|
| CN201510052026.5A CN104596945B (en) | 2015-02-02 | 2015-02-02 | Radio frequency fuel oil hazard detection device |
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| CN104596945B CN104596945B (en) | 2017-04-05 |
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