CN103499433A - Distortion calibration device and method for f-theta optical system - Google Patents
Distortion calibration device and method for f-theta optical system Download PDFInfo
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- CN103499433A CN103499433A CN201310468730.XA CN201310468730A CN103499433A CN 103499433 A CN103499433 A CN 103499433A CN 201310468730 A CN201310468730 A CN 201310468730A CN 103499433 A CN103499433 A CN 103499433A
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Abstract
The invention provides a distortion testing device for an f-theta optical system. The testing device comprises a turntable, a guide rail, a target generator and an image analyzer in sequential arrangement, wherein the guide rail is arranged on the turntable, the target generator is arranged at the object space of a calibrated optical system, and the image analyzer is arranged at the image space of the calibrated optical system. The distortion calibration device and a distortion calibration method for the f-theta optical system have the advantage that the providing of targets in different object distances can be simultaneously realized.
Description
Technical field
The invention belongs to the optic test field, relate to a kind ofly for demarcating the device and method of f-θ optical system distortion, relate in particular to a kind of optical camera for f-theta structure form in the demarcation distorted with optical system before detector dock.
Background technology
F-θ optical system circular fisheye head, more than its visual field can reach 180 degree, its special applications aspect photography has been well-known, however fish-eye purposes is far above this.At aspects such as astronomy, meteorology, film, measurement, pipe detection, fire prevention supervision, medical endoscope detecting and even public security, frontier defenses, they also have ample scope for one's abilities.In the current information age, the fish eye lens application of succeeding in fields such as navigation, location, remote sensing, optical communication, machine vision, small intelligent systems again; And in national defence and military affairs, they occupy important and irreplaceable status especially, but fish-eye design is more much more difficult than conventional system, and fisheye camera once can be taken the approximately scenery of 180 degree field ranges, camera with the ordinary optical system is compared, and fisheye photo has comprised more information.Therefore, fisheye camera is in vision guided navigation and extensive application in large field object identification and location closely.But, because fish-eye singularity causes fisheye camera, very serious anamorphose being arranged, fish-eye imaging plane is not plane, but is similar to spherical curved surface, therefore, panorama picture of fisheye lens is not desirable perspective projection.High-precision calibrating fish eye lens parameter becomes one of gordian technique in the flake vision system, in its parameter, have one most important be exactly the distortion of optical system.Although distortion does not affect image definition, optical system has distortion but directly to affect the geometric position precision of imaging, and the larger distortion in visual field is larger.In order to obtain geometric position image accurately, although optical system is proofreaied and correct as far as possible for the distortion of different visual fields when design, but will inevitably produce error owing to processing and assembling, cause optical system and the design result of final molding to have relatively large deviation, this need to accurately measure the amount of distortion of optical system with regard to requiring, manage to find out the actual distortion error distribution of optical system, revised by the method for mathematics in case of necessity, to reach, put forward high-precision purpose.Still be not specifically designed at present device or method that the distortion of f-θ optical system is demarcated, accidental report is used the special target of making to carry out qualitative checking, the method drawback is more: dissimilar f-θ optical system need design different targets, can't realize versatility; Even same f-θ optical system is under the different object distances condition, the target size is also different; Target comparison complexity; Measuring accuracy is low, is subject to the impact that target is made and demarcated, and the stated accuracy that finally distorts is in one of percentage left and right; Target is planar graph, and real curved surface effect can't be provided.
Summary of the invention
In order to solve existing technical matters in background technology, the present invention proposes a kind of caliberating device and method for the distortion of f-θ optical system, providing of different object distances target can be provided simultaneously.
Technical solution of the present invention is: a kind of distortion testing device of f-θ optical system is characterized in that: the target generator of the optical system object space that described proving installation comprises the turntable that sets gradually, the guide rail on turntable, demarcated, demarcated the picture analyzer of the image space of optical system.
Above-mentioned target generator comprises light source, collimating mirror, optical filter, condenser, star orifice plate and the target micro mirror be successively set on guide rail, and described light source, collimating mirror, optical filter, condenser, star orifice plate and target micro mirror are arranged on same optical axis.
Above-mentionedly as analyzer, comprise image-forming objective lens, detector and three-dimensional traversing carriage; Described image-forming objective lens is connected with detector according to certain imaging relations, and described image-forming objective lens and detector are arranged on three-dimensional dimension traversing carriage.
Above-mentioned proving installation also comprises computing unit, and described computing unit comprises computing machine, and described computing machine comprises the automatic control unit of controlling turntable, guide rail, the motion of two-dimensional movement support and the calculation processing unit that calculates distortion.
Above-mentioned picture analyzer and computer installation are on platform, and the described front end as analyzer is provided for the fixedly special tooling of f-θ optical system.
Above-mentioned turntable and guide rail are manual form or electronic control.
Above-mentioned target generator outer setting black box, described black box is metal cabinet or the black cloth cover that carries out blackening process.
A kind of distortion method of testing of f-θ optical system is characterized in that: said method comprising the steps of:
1) target generator is fixed on the long guideway objective table, by the movement of long guideway, provides the target of different distance;
2) long guideway is arranged on turntable, f-θ optical system is contained on special tooling; Long guideway moves forward and backward, and makes target be positioned at the standard operation distance of f-θ optical system, and target is received by the picture analyzer after f-θ optical system imaging;
3) light that light source sends becomes the collimated light outgoing after condenser, after optical filter is converted to needed wavelength, again through condenser, illuminate the star orifice plate, the star orifice plate be illuminated dwindles imaging after target micro mirror, as final goal, offers tested f-θ optical system;
4) the final goal picture is detected the device reception after image-forming objective lens;
5) corresponding parameter is set in computing machine, auto-control software is controlled turntable and is rotated standard angle, interlock is simultaneously controlled the two-dimensional movement support in the vertical tested optical system translation of image planes, now can on the picture detector of analyzer, through f-θ optical system imaging, gather the angle of turntable rotation, length, the target image that three-dimensional traversing carriage moves by display-object simultaneously;
6) auto-control software control turntable rotates in f-θ optical system visual field, after often turning over a field angle, completes the control collecting work, obtains a series of turntable angle ω
i, the two-dimensional movement support length y
iand target image;
7) read the positional information l of asterism picture in target image
i, then calculate the distortion of the different visual fields of f-θ optical system according to the distortion algorithm.
In step 7), distortion algorithm computing method are:
δy=y
i-fgω
i （1）
δ y is absolute distortion, y
ibe the amount of movement of three-dimensional traversing carriage, f is the optimal computed focal length, ω
ithe angle that turntable turns over, l
ithe coordinate position of target asterism picture on detector that the software interpretation goes out.
Advantage of the present invention is:
1) can realize providing of different object distances target simultaneously;
2) drive target simulator by turntable and rotate, can realize thering is providing of curved surface effect target;
3) be designed with position in target simulator and assign optical filter and weakener, can regulate the emission spectrum of target and signal power to meet the demarcation needs of different optical system;
4) use this device can realize the demarcation of different object distances, different operating spectral coverage optical system, there is versatility, high efficiency;
5) measuring accuracy is high, and the stated accuracy that relatively distorts can reach ten thousand/.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Embodiment
The present invention is a kind of distortion testing device of f-θ optical system, comprise turntable 1, long guideway 2, the target generator be comprised of light source 4, collimating mirror 5, optical filter 6, condenser 7, star orifice plate 8, target micro mirror 9, special tooling 11, forming as analyzer, computing machine 15, platform 16 of being comprised of image-forming objective lens 12, detector 13, three-dimensional traversing carriage 14, computing machine 15 comprises auto-control software, computing software; Target generator is arranged on the optical system object space of being demarcated, and is arranged on the image space of being demarcated optical system as analyzer, and moving component is connected with computing machine, by auto-control software, controls its motion.
The effect of turntable 1 is to drive target generator to rotate, and for f-θ optical system provides the axle target of visual field outward, can be instrument automatically controlled or manual form, that can provide precision corner; The effect of long guideway 2 is to drive the target generator rectilinear motion, for f-θ optical system provides the target of limited working distance, can be manual or automatically controlled, can be also the line slideway of other form or translation stage etc.; The effect of black box 3 is, in the optical element of target generator is placed on, to prevent the interference of external light source, affects test result, can be that metal cabinet carries out blackening process, also can get up with the black cloth cover;
Light source 4 can be the luminous objects of all energy such as Halogen lamp LED, can illuminate the target graticule to get final product, and just brightness and the spectral range difference of light source, require size as far as possible little; The effect of collimating mirror 5 is that light source 4 energy are collimated; The effect of optical filter 6 is the needs according to tested f-θ optical system, and light source 4 is carried out to filtering, offers the spectral range that f-θ optical system needs; The effect of condenser 7 is assembled light source again; Star orifice plate 8 is in order to f-θ optical system to be tested, to provide imageable target; The effect of target micro mirror 9 is that star orifice plate 8 is carried out to convergent-divergent, star orifice plate 8 sizes can be strengthened like this, saves the unmanageable difficult problem in starlet hole, and can collect more energy; The effect of special tooling 11 is to support tested optical system, and is convenient to the adjustment of optical system;
Effect as analyzer is that the target become through tested optical system is looked like to be received; Adopting detector 13 is in order more than enough people to watch in real time, can be tested the optical system of any spectral coverage, and can gather image for follow-up result calculating and process; The moving support 14 of triple motion can drive image-forming objective lens and detector seesaws and finds image planes along tested system optical axis, and can drive image-forming objective lens tested system optical axis side-to-side movement vertical with detector, gather the information of the outer visual field of axle target picture, in order to improve measuring accuracy, the motion requirement of left and right directions can provide the length information that ratio of precision is higher, can be the precise mobile platform with digital display or grating scale, can be also the length movable information that adopts laser ranging method to provide.
Auto-control software can be controlled the moving support 14 of turntable 1, long guideway 2, triple motion and be moved as required; Computing software is a kind of algorithm in conjunction with tested Optical System Design actual computation distortion; The effect of optical table 16 is to place other equipment, is convenient to debug measurement, can be any platform, support, as long as other equipment of carrying that can be reliable and stable.
Specific works process of the present invention and principle:
The principle of work of target generator: the light that light source 4 sends becomes the collimated light outgoing after condenser 5, after optical filter 6 is converted to needed wavelength, again through condenser 7, illuminate star orifice plate 8, the star orifice plate 8 be illuminated dwindles imaging after target micro mirror 9, as final goal, offers tested f-θ optical system;
Target generator is fixed on long guideway 2 objective tables, by the movement of long guideway 2, can provides the target of different distance; Long guideway 2 is arranged on turntable 1, then f-θ optical system is contained on special tooling 11; Long guideway 2 moves forward and backward, and makes target be positioned at the standard operation distance of f-θ optical system, and target is received by the picture analyzer after f-θ optical system imaging;
The principle of work of picture analyzer: the target picture, after image-forming objective lens 12 carries out imaging, is received by detector 13, completes the collection of final image; Adjustment aim generator optical axis, f-θ system optical axis and be positioned on straight line as the analyzer optical axis, regulate as the three-dimensional traversing carriage 14 of analyzer along f-θ system optical axis direction, is located at best image planes position, starts test;
Corresponding parameter is set in computing machine 15, auto-control software is controlled turntable 1 and is rotated standard angle, interlock is simultaneously controlled two-dimensional movement support 14 in the vertical tested optical system translation of image planes, now can on the picture detector 13 of analyzer, through f-θ optical system imaging, gather the angle of turntable 1 rotation, length, the target image that three-dimensional traversing carriage 15 moves by display-object simultaneously;
Auto-control software is controlled turntable 1 and is rotated in f-θ optical system visual field, after often turning over a field angle, completes the control collecting work, so just obtains a series of turntable angle ω
i, the two-dimensional movement support length y
iand target image;
Utilize computing software, read the positional information l of asterism picture in target image
i, then calculate the distortion of the different visual fields of f-θ optical system;
The distortion algorithm is to produce principle according to distortion, in the optical system image planes, surveys different visual fields image height and corresponding field angle, adopts weighted least-squares method to carry out matching to full visual field focal length and obtains pinpointed focus.Then the standard angle rotated by pinpointed focus and turntable calculates theoretical image height, calculates theoretical image height and is absolute distortion δ y with the difference of actual measurement image height.
δy=y
i-fgω
i （1）
Wherein f is the optimal computed focal length, and computing formula is as follows:
δ y is absolute distortion, y
ibe the amount of movement of three-dimensional traversing carriage, f is the optimal computed focal length, ω
ithe angle that turntable turns over, l
ithe coordinate position of target asterism picture on detector that the software interpretation goes out.
Claims (9)
1. the distortion testing device for f-θ optical system is characterized in that: the target generator of the optical system object space that described proving installation comprises the turntable that sets gradually, the guide rail on turntable, demarcated, demarcated the picture analyzer of the image space of optical system.
2. the distortion testing device for f-θ optical system according to claim 1, it is characterized in that: described target generator comprises light source, collimating mirror, optical filter, condenser, star orifice plate and the target micro mirror be successively set on guide rail, and described light source, collimating mirror, optical filter, condenser, star orifice plate and target micro mirror are arranged on same optical axis.
3. the distortion testing device for f-θ optical system according to claim 2 is characterized in that: describedly as analyzer, comprise image-forming objective lens, detector and three-dimensional traversing carriage; Described image-forming objective lens is connected with detector according to certain imaging relations, and described image-forming objective lens and detector are arranged on three-dimensional traversing carriage.
4. according to claim 1 or the 2 or 3 described distortion testing devices for f-θ optical system, it is characterized in that: described proving installation also comprises computing unit, described computing unit comprises computing machine, and described computing machine comprises the automatic control unit of controlling turntable, guide rail, the motion of two-dimensional movement support and the calculation processing unit that calculates distortion.
5. the distortion testing device for f-θ optical system according to claim 4, it is characterized in that: described picture analyzer and computer installation are on platform, and the described front end as analyzer is provided for the fixedly special tooling of f-θ optical system.
6. the distortion testing device for f-θ optical system according to claim 5, it is characterized in that: described turntable and guide rail are manual form or electronic control.
7. the distortion testing device for f-θ optical system according to claim 6, it is characterized in that: described target generator outer setting black box, described black box is metal cabinet or the black cloth cover that carries out blackening process.
8. the distortion method of testing for f-θ optical system is characterized in that: said method comprising the steps of:
1) target generator is fixed on the long guideway objective table, by the movement of long guideway, provides the target of different distance;
2) long guideway is arranged on turntable, f-θ optical system is contained on special tooling; Long guideway moves forward and backward, and makes target be positioned at the standard operation distance of f-θ optical system;
3) light that light source sends becomes the collimated light outgoing after condenser, after optical filter is converted to needed wavelength, again through condenser, illuminate the star orifice plate, the star orifice plate be illuminated dwindles imaging after target micro mirror, as final goal, offers tested f-θ optical system;
4) adjustment aim generator optical axis, f-θ system optical axis and be positioned on straight line as the analyzer optical axis, regulate as analyzer two-dimensional movement support along f-θ system optical axis direction, is located at best image planes position;
5) corresponding parameter is set in computing machine, auto-control software is controlled turntable and is rotated standard angle, interlock is simultaneously controlled three-dimensional traversing carriage in the vertical tested optical system translation of image planes, now can on the picture detector of analyzer, through f-θ optical system imaging, gather the angle of turntable rotation, length, the target image that three-dimensional traversing carriage moves by display-object simultaneously;
6) auto-control software control turntable rotates in f-θ optical system visual field, after often turning over a field angle, completes the control collecting work, obtains a series of turntable angle ω
i, the two-dimensional movement support length y
iand target image;
7) read the positional information l of asterism picture in target image
i, then calculate the distortion of the different visual fields of f-θ optical system according to the distortion algorithm.
9. the distortion method of testing for f-θ optical system according to claim 8 is characterized in that: in described step 7), distortion algorithm computing method are:
δy=y
i-fgω
i （1）
δ y is absolute distortion, y
ibe the amount of movement of three-dimensional traversing carriage, f is the optimal computed focal length, ω
ithe angle that turntable turns over, l
ithe coordinate position of target asterism picture on detector that the software interpretation goes out.
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| CN106153302A (en) * | 2015-03-24 | 2016-11-23 | 北京威斯顿亚太光电仪器有限公司 | A kind of measuring method for rigid pipe endoscope image deformation |
| CN107063644A (en) * | 2017-06-05 | 2017-08-18 | 上海航天测控通信研究所 | Finite is away from distortion measurement method and system |
| CN107796600A (en) * | 2017-10-24 | 2018-03-13 | 大族激光科技产业集团股份有限公司 | A kind of method of testing and test system of the uniform performance of f theta focus lamps |
| CN110806572A (en) * | 2019-11-18 | 2020-02-18 | 中国科学院上海技术物理研究所 | Long-focus laser three-dimensional imager distortion testing device and method based on angle measurement method |
| CN111665023A (en) * | 2020-06-24 | 2020-09-15 | 中国科学院西安光学精密机械研究所 | Telescope distortion measuring device and method |
| CN112083578A (en) * | 2020-08-26 | 2020-12-15 | 中国科学院西安光学精密机械研究所 | Target simulator for image surface docking of photoelectric equipment, debugging system and method |
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| CN104865047A (en) * | 2014-02-24 | 2015-08-26 | 九骅科技股份有限公司 | Optical detection method and device for composite object distance |
| CN104865047B (en) * | 2014-02-24 | 2017-08-25 | 九骅科技股份有限公司 | The optical detection apparatus of combined type object distance |
| CN106153302A (en) * | 2015-03-24 | 2016-11-23 | 北京威斯顿亚太光电仪器有限公司 | A kind of measuring method for rigid pipe endoscope image deformation |
| CN106153302B (en) * | 2015-03-24 | 2019-03-12 | 北京威斯顿亚太光电仪器有限公司 | A kind of measurement method for rigid pipe endoscope image deformation |
| CN107063644A (en) * | 2017-06-05 | 2017-08-18 | 上海航天测控通信研究所 | Finite is away from distortion measurement method and system |
| CN107063644B (en) * | 2017-06-05 | 2020-06-12 | 上海航天测控通信研究所 | Finite object distance distortion measuring method and system |
| CN107796600A (en) * | 2017-10-24 | 2018-03-13 | 大族激光科技产业集团股份有限公司 | A kind of method of testing and test system of the uniform performance of f theta focus lamps |
| CN110806572A (en) * | 2019-11-18 | 2020-02-18 | 中国科学院上海技术物理研究所 | Long-focus laser three-dimensional imager distortion testing device and method based on angle measurement method |
| CN111665023A (en) * | 2020-06-24 | 2020-09-15 | 中国科学院西安光学精密机械研究所 | Telescope distortion measuring device and method |
| CN111665023B (en) * | 2020-06-24 | 2021-10-12 | 中国科学院西安光学精密机械研究所 | Telescope distortion measuring device and method |
| CN112083578A (en) * | 2020-08-26 | 2020-12-15 | 中国科学院西安光学精密机械研究所 | Target simulator for image surface docking of photoelectric equipment, debugging system and method |
| CN112083578B (en) * | 2020-08-26 | 2021-06-22 | 中国科学院西安光学精密机械研究所 | Target simulator for image surface docking of photoelectric equipment, debugging system and method |
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