CN102589607B - Split large screen-based multi-target optical fiber positioning simulation calibration method and equipment - Google Patents

Split large screen-based multi-target optical fiber positioning simulation calibration method and equipment Download PDF

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CN102589607B
CN102589607B CN201210066073.1A CN201210066073A CN102589607B CN 102589607 B CN102589607 B CN 102589607B CN 201210066073 A CN201210066073 A CN 201210066073A CN 102589607 B CN102589607 B CN 102589607B
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optical fiber
screen
large screen
giant
fiber positioning
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CN102589607A (en
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张勇
李烨平
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Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS
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Nanjing Institute of Astronomical Optics and Technology NIAOT of CAS
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Abstract

The invention discloses a split large screen-based multi-target optical fiber positioning simulation calibration method and equipment. The method comprises the following steps of: (1) setting a split large screen in front of a multi-target optical fiber positioning system; (2) directly measuring the overall large screen, and calibrating the mutual spatial position coordinates of each display unit in a large-screen coordinate system; (3) simulating and generating an astronomical spectrum observation target corresponding to an optical fiber on the large screen, and ordering the optical fiber positioning system to realize positioning according to the geometric transformation relation between the large screen and a focal plane position; and (4) performing two-dimensional alignment scanning positioning by using an optical fiber positioning movement mechanism and a simulated astronomical spectrum observation target source, exposing and acquiring integral optical fiber spectrum energy by using a camera, and precisely calibrating the ideal position of an optical fiber positioning unit and positioning the movement precision by using the optical fiber positioning movement mechanism by acquiring the analogue Gaussian fitting of discrete energy and the position data and performing interpolation processing. The equipment is simple in structure and low in cost. The performance and precision of multi-target optical fiber positioning are improved and guaranteed in real time.

Description

Multiple goal optical fiber positioning simulation calibration method and equipment thereof based on splicing large screen
Technical field
The present invention relates to a kind of multiple goal fiber orientation analogy method based on splicing large screen, be highly suitable for judgement and the checking of analogue scaling detection, detent mechanism exercise test and the located in connection precision of the telescopical multiple goal fiber orientation of multi-object fiber spectrographs.The invention still further relates to the equipment that this multiple goal fiber orientation analogy method based on splicing large screen is used.
Background technology
Uranology is just entering a flourish new period, is embodied as picture and spectrum observation in space/ground all band.But for optical region physical message content maximum, accumulation at most, use also the most ripe sky volume property and the understanding of behavior, imaging the obtained number of touring the heavens also very extremely lacks in the spectral information of 10,000,000,000 celestial body relatively.New multi objective spectrum survey telescope and related key technical thereof are arisen at the historic moment just, the wherein multiple goal fiber unit location technology of one of key core technology, main in order on a very large-sized virtual plane or sphere focal plane, enough accurately dispose and locate large batch of spectroscopic fibers (end face), thereby take turns observation and time all will accurately aim at a large amount of Celestial Objects and collect spectral energy every, realize high precision spectrum survey.But how, in the plane or sphere focal plane of a large scale, testing the precision of a large amount of multiple goal fiber orientation, successfully detect and verify micron-sized fiber orientation precision, is a difficult problem.
Current is for state-of-the-art multiple goal fiber orientation technology in the world, is that China Science & Technology University's precision optical machinery and exact instrument are that the double back of the parallel controlled subregion of independent development turns fiber orientation technology.And conventional fiber location calibration test adopts photographic process, utilizing the optical fiber back of the body according to fiber end face is taken pictures and calibrated behind large focal plane point community, finally splice and combine, adopt fitting of a polynomial, but in actual field, can additionally be subject to the combined influence of the many factors such as positioning unit mechanism, camera attitude, camera position variation, camera error, picture element, seeing, optical fiber attributes, focal plane temperature deformation, focal plane gravity deformation, subregion splicing, plane and spherical co-ordinate conversion, actual final all fiber orientation precision are difficult to real checking and judge.
Along with the development of multiple goal spectrum survey and more and more higher number of unit and accuracy requirement, the current optical fiber back of the body that utilizes according to the shortcoming of the photographic process of (illumination of optical fiber active distal) is: can be subject to such as camera attitude, camera position changes, camera error, picture element, positioning unit mechanism, seeing, optical fiber attributes, focal plane surface geometry shape, focal plane temperature deformation, focal plane gravity deformation, subregion splicing, the combined influence of the many factors such as plane and spherical co-ordinate conversion, cannot be accurately and test position fix unit mechanisms motion and cannot verify whole fiber orientation precision easily.
Summary of the invention
In order to further develop multiple goal fiber orientation calibration technology, overcome the deficiency of current calibration technology, the present invention is directed to multiple goal fiber orientation technology, by simple technological design, cost realizes the multiple goal optical fiber positioning simulation calibration based on splicing large screen compared with lowland, and a kind of design of the multiple goal optical fiber positioning simulation calibration method based on splicing large screen is provided.The present invention is also by the equipment that provides this multiple goal fiber orientation analogy method based on splicing large screen to use.
The technical solution adopted for the present invention to solve the technical problems is: a kind of multiple goal optical fiber positioning simulation calibration method based on splicing large screen, it is characterized in that, and step is as follows:
(1) .the giant-screen of a splicing is set before multiple goal optical fibre positioning system, and what described splicing large screen adopted can be liquid crystal-spliced, or projective large-screen, or plasma splicing large screen;
(2) .to giant-screen directly entirety measure, under whole giant-screen coordinate system, calibrate the mutual locus coordinate of each display unit (or be called " the small screen unit ", for example, single liquid crystal or single plasmatron);
(3) .utilize computer technology to simulate on giant-screen and produce astronomical spectrum observation target corresponding to whole optical fiber, according to giant-screen and position of focal plane geometric transformation relation, and order optical fibre positioning system is realized location;
(4) .carrying out relative two-dimensional alignment Scan orientation by fiber orientation motion with the astronomical spectrum observation target source of simulation (can be fixed fiber positioning system, on giant-screen, simulate the two-dimensional scan that observed object source position two dimension changes, or target source on fixing giant-screen, on focal plane, move to realize two-dimentional scanning with optical fiber detent mechanism), obtain integration optical fiber spectral energy with camera exposure, by the above-mentioned class Gauss's who obtains conventional and position data matching and interpolation processing, can the current fiber orientation of precise calibration unit ideal position and fiber orientation motion setting movement precision.
The present invention is as Fig. 1, by adopting and demarcate splicing large screen (as Fig. 2), set up the coordinate transformation relation of giant-screen unified coordinate system and theoretical focal plane (fiber end face place face), utilize the advantage of above-mentioned transformational relation and Digital image technology, simulation produces whole astronomical spectrum observation target sources (as Fig. 3) and carries out optical fiber and just locate, by changing and (fix one with the active two-dimensional scan of the relative position of fiber unit based on whole astronomical spectrum observation target sources, initiatively microcosmic is adjusted another one, as Fig. 4 and Fig. 5), collect at fiber-optic output the energy that discrete scanning obtains, record correspondence position information, by class Gauss curve fitting and the interpolation of energy datum information, can obtain ideal fiber position location, with and with just position location difference of optical fiber, it is fiber orientation precision.
The scheme that completes the 2nd invention task of the application is: the above-mentioned multiple goal optical fiber positioning simulation calibration method based on splicing large screen uses, a kind of multiple goal optical fiber positioning simulation calibration equipment based on splicing large screen, the face base plate back side of multiple goal optical fibre positioning system is fixed with each Optic transmission fiber, it is characterized in that, a splicing large screen is set before described base plate; This splicing large screen with can connect at the computing machine that change on giant-screen simulation and produce (all optical fiber is corresponding) astronomical spectrum observation target; Meanwhile, be provided with the camera for astronomical sight.
What described splicing large screen adopted can be liquid crystal-spliced, or projective large-screen, or plasma splicing large screen.
The present invention innovates and proposes and utilized splicing large screen simulation to produce multi-object fiber spectrographs observed object source, can the active two-dimensional scan with the relative position of fiber unit by whole astronomical spectrum observation target sources easily, obtain the fiber orientation precision of the large system of whole fiber orientation.
At the optical fiber scanning for target source (Fig. 5) that utilizes the target source motion on giant-screen of fixed fiber unit to realize scanning (Fig. 4) and fixed-analog afterwards, go out according to the matching of dimensional Gaussian distribution function interpolation the position that energy is greatly corresponding, ideal fiber is determined bit position; By calculating the poor of the first location of optical fiber and ideal fiber position location, can advise to calculate and calibrate out whole optical fibre positioning system precision.
Actual astronomical spectrum target source, has certain size, depends on the resultant effect of telescopical optics picture element, platform location seeing and tracking accuracy etc.Mate suitable scanning step and grid by selection, such as 3X3,5X5 or more, realize effective two-dimensional micromotion scanning.
Precision analysis, the fine motion of fiber orientation mechanism, relevant with Design of Stepper Motor Subdivision, owing to adopting, two rotating turning radius are very little, thereby can realize micron dimension; And the precision of astronomical spectrum observation target source also can simulate very high micron dimension barycenter error (target source yardstick is more symmetrical more greatly, and Centroid accuracy is higher) on giant-screen; Final fiber orientation ideal position also can be scaled to micron dimension precision.In addition the distance of splicing large screen and focal plane is very near, but accuracy requirement is not high, because fiber orientation lateral attitude on focusing plane substantially, vertical direction is insensitive.The present invention is not difficult to realize.
After obtaining ideal fiber position location and realizing location, can realize the attitude of fiber orientation and focal plane system, the long-term detection of thermal deformation.
The present invention has whole fiber orientation unit, the namely high precision fast of whole optical fibre positioning system calibration ability.
The invention has the beneficial effects as follows, provide a kind of novelty cheap easily a kind of multiple goal fiber orientation analogy method scheme based on splicing large screen of row, be highly suitable for the telescopical multiple goal fiber orientation calibration of multi-object fiber spectrographs.Utilize geometrical optics to aim at and rapid inching two-dimensional scan principle among a small circle, realized the telescopical multiple goal fiber orientation of multi-object fiber spectrographs by the process of suggestion.Principle understands, simple in structure, with low cost.Owing to having adopted splicing panel and splicing target surface, can realize nearly real-time fiber orientation calibration, move towards real-time Active fiber location analogue scaling for the photographic process development by traditional, improve and real-time ensuring performance and the precision of multiple goal fiber orientation, implementing process is simple, greatly reduce labour intensity, and then reduced cost.
Accompanying drawing explanation
Fig. 1 multiple goal optical fiber positioning simulation calibration system schematic;
Fig. 2 splicing large screen schematic diagram;
Whole observational astronomy target sources of simulating on Fig. 3 screen;
Fig. 4 initiatively simulates astronomical spectrum target source and changes to realize two-dimensional scan;
Initiatively fiber orientation fine motion two-dimensional scan among a small circle of Fig. 5.
Embodiment
Embodiment 1, the multiple goal fiber orientation analogy method based on splicing large screen, in Fig. 1, system for antenna supervising comprises focal plane base plate 1, fiber orientation unit 2, virtual theoretical focal plane 3, splicing large screen 4, the small screen unit 5 and Optic transmission fiber 6; Fig. 2 is the giant-screen of splicing; Fig. 3 is the astronomical sight target source that simulation shows on giant-screen; Fig. 4 and Fig. 5, for being respectively two kinds of active alignment calibration modes, wherein comprise fiber end face 7 and astronomical spectrum target source 8, and Fig. 7 is the change in location of initiatively simulating astronomical spectrum target source on giant-screen, realize interior two-dimensional scan among a small circle; And Fig. 8 is initiatively at inner fiber positioning unit mechanism kinematic among a small circle, realize fiber end face two-dimensional scan.
Be fixed on the splicing large screen before focal plane, it can be the giant-screen that utilizes little liquid crystal or plasma splicing, also can be the projection screen that projector produces, simulate and on giant-screen, show astronomical sight target source by calculating, then by calibrating unified screen coordinate system and focal plane coordinate system geometric transformation relation, carry out whole optical fiber aligns and just locate, adopt camera to collect fiber-optic output energy; The size that can realize astronomical target source by simulation below changes, signal to noise ratio (S/N ratio) changes and change in location (among a small circle fine motion fast two-dimensional scanning) is calibrated the precision of fiber orientation, also can carry out by the fast two-dimensional of the fine motion among a small circle scanning of actual fiber detent mechanism the fixing astronomical target source of accurate active alignment simulation, obtain the calibration precision of actual fiber location.Final fiber orientation precision, matching and the interpolation of the result of active scan among a small circle that can obtain by these two kinds of methods respectively obtain.

Claims (6)

1. the multiple goal optical fiber positioning simulation calibration method based on splicing large screen, is characterized in that, step is as follows:
(1) .the giant-screen of a splicing is set before multiple goal optical fibre positioning system;
(2) .to directly entirety measurement of giant-screen, under whole giant-screen coordinate system, calibrate the mutual locus coordinate of each display unit;
(3) .utilize computer technology to simulate on giant-screen and produce astronomical spectrum observation target corresponding to whole optical fiber, according to giant-screen and position of focal plane geometric transformation relation, and order optical fibre positioning system is realized location;
(4) .carry out relative two-dimensional alignment Scan orientation by fiber orientation motion with the astronomical spectrum observation target source of simulation, obtain integration optical fiber spectral energy with camera exposure, by class Gauss curve fitting and the interpolation of energy datum information, the current fiber orientation of precise calibration unit ideal position and fiber orientation motion setting movement precision.
2. the multiple goal optical fiber positioning simulation calibration method based on splicing large screen according to claim 1, is characterized in that, the splicing large screen of step described in is (1) liquid crystal-spliced giant-screen, or projective large-screen, or plasma splicing large screen.
3. the multiple goal optical fiber positioning simulation calibration method based on splicing large screen according to claim 1, is characterized in that, the display unit of step described in (2), refers to single liquid crystal or single plasmatron.
4. the multiple goal optical fiber positioning simulation calibration method based on splicing large screen according to claim 1, is characterized in that, step is carried out relative two-dimensional alignment Scan orientation described in (4), refers to one of following two kinds of modes:
Fixed fiber positioning system is simulated the two-dimensional scan that observed object source position two dimension changes on giant-screen; Or,
Target source on fixing giant-screen moves to realize two-dimentional scanning with optical fiber detent mechanism on focal plane.
5. the multiple goal optical fiber positioning simulation calibration method based on splicing large screen claimed in claim 1 uses, a kind of multiple goal optical fiber positioning simulation calibration equipment based on splicing large screen, the face base plate back side of multiple goal optical fibre positioning system is fixed with each Optic transmission fiber, it is characterized in that, a splicing large screen is set before described base plate; The computing machine of the astronomical spectrum observation target that this splicing large screen is corresponding with can simulate the whole optical fiber of generation on this giant-screen connects; Meanwhile, be provided with the camera for astronomical sight.
6. the multiple goal optical fiber positioning simulation calibration equipment based on splicing large screen according to claim 5, is characterized in that, what described splicing large screen adopted is liquid crystal-spliced, or projective large-screen, or plasma splicing large screen.
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