CN203606107U - Calibration device for distortion of f-theta optical system - Google Patents
Calibration device for distortion of f-theta optical system Download PDFInfo
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- CN203606107U CN203606107U CN201320621505.0U CN201320621505U CN203606107U CN 203606107 U CN203606107 U CN 203606107U CN 201320621505 U CN201320621505 U CN 201320621505U CN 203606107 U CN203606107 U CN 203606107U
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Abstract
The utility model provides a calibration device for the distortion of an f-theta optical system, and the device comprises a rotating table, a guide rail disposed on the rotating table, an object space target generator of a calibrated optical system, and an image-space image analyzer of the calibrated optical system, wherein the rotating table, the guide rail, the object space target generator and the image-space image analyzer are sequentially arranged. The device provided by the utility model can achieve that objects in various object distances are provided at the same time.
Description
Technical field
The utility model belongs to optic test field, relates to a kind of device distorting for demarcating f-θ optical system, relates in particular to the demarcation of a kind of optical camera for f-theta structure form optical system distortion before docking with detector.
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, but 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 scenery of approximately 180 degree field ranges, camera with 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 causing fisheye camera, fish-eye singularity has very serious anamorphose, and fish-eye imaging plane is not plane, but is similar to spherical curved surface, and therefore, panorama picture of fisheye lens is not desirable perspective projection.High-precision calibrating fish eye lens parameter becomes one of gordian technique in 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 in the time of 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 if desired, put forward high-precision object to reach.Still be not specifically designed at present the device that the distortion of f-θ optical system is demarcated, accidental report uses the special target of making to carry out qualitative checking, and the method drawback is more: dissimilar f-θ optical system need design different targets, cannot realize versatility; Even if same f-θ optical system is under different object distances condition, 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 cannot be provided.
Utility model content
In order to solve existing technical matters in background technology, the utility model proposes a kind of caliberating device for the distortion of f-θ optical system, providing of different object distances target can be provided simultaneously.
Technical solution of the present utility model 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 guide rail on turntable, the turntable setting gradually, demarcated, demarcated the picture analyzer of the image space of optical system.
Above-mentioned target generator comprises the light source, collimating mirror, optical filter, condenser, star orifice plate and the target micro mirror that are 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 comprise image-forming objective lens, detector and three-dimensional traversing carriage as analyzer; 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 to be controlled the automatic control unit of turntable, guide rail, the motion of two-dimensional movement support and calculates the calculation processing unit of distortion.
Above-mentioned picture analyzer and computer installation are on platform, and the described front end as analyzer is provided for the special tooling of fixing 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.
The utility model has the advantages that:
1) can realize providing of different object distances target simultaneously;
2) drive target simulator to rotate by turntable, can realize providing of curved surface effect target is provided;
3) in target simulator, be designed with position 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, have versatility, work efficiency is high;
5) measuring accuracy is high, and the stated accuracy that relatively distorts can reach ten thousand/.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Embodiment
The utility model is a kind of distortion testing device of f-θ optical system, comprise turntable 1, long guideway 2, the target generator being made up 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 made up 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 its motion of auto-control software control.
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 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 line slideway or the translation stage etc. of other form; 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 black cloth cover;
That the target becoming through tested optical system is looked like to receive as the effect of analyzer; Adopting detector 13 is in order more than enough people to watch in real time, can to test 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 to seesaw and find 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 move 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 utility model and principle:
The principle of work of target generator: the light that light source 4 sends becomes collimated light outgoing after condenser 5, after optical filter 6 is converted to needed wavelength, again illuminate star orifice plate 8 through condenser 7, the star orifice plate 8 being illuminated dwindles imaging after target micro mirror 9, offers tested f-θ optical system as final goal;
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, target after f-θ optical system imaging by receiving as analyzer;
The principle of work of picture analyzer: target picture carries out, after imaging, being received by detector 13 through image-forming objective lens 12, 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 control turntable 1 rotates 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 that turntable 1 rotates, length, the target image that three-dimensional traversing carriage 15 moves by display-object simultaneously;
Auto-control software control turntable 1 rotates in f-θ optical system visual field, often turns over after a field angle, completes control collecting work, so just obtains a series of turntable angle ω
i, 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;
Distortion algorithm is to produce principle according to distortion, surveys different visual fields image height and corresponding field angle in optical system image planes, adopts weighted least-squares method to carry out matching to full visual field focal length and obtains pinpointed focus.Then the standard angle being 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 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 optimal computed focal length, ω
ithe angle that turntable turns over, l
ithe coordinate position of the target asterism picture that goes out of software interpretation on detector.
Claims (7)
1. for a caliberating device for f-θ optical system distortion, it is characterized in that: the target generator of the optical system object space that described device comprises guide rail on turntable, the turntable setting gradually, demarcated, demarcated optical system image space look like analyzer.
2. the caliberating device for the distortion of f-θ optical system according to claim 1, it is characterized in that: described target generator comprises the light source, collimating mirror, optical filter, condenser, star orifice plate and the target micro mirror that are 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 caliberating device for f-θ optical system distortion according to claim 2, is characterized in that: describedly comprise image-forming objective lens, detector and three-dimensional traversing carriage as analyzer; 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 the caliberating device for the distortion of f-θ optical system described in claim 1 or 2 or 3, it is characterized in that: described device also comprises computing unit, described computing unit comprises computing machine.
5. the caliberating device for the distortion of f-θ optical system according to claim 4, is characterized in that: described picture analyzer and computer installation are on platform, and the described front end as analyzer is provided for the special tooling of fixing f-θ optical system.
6. the caliberating device for the distortion of f-θ optical system according to claim 5, is characterized in that: described turntable and guide rail are manual form or electronic control.
7. the caliberating device for the distortion of f-θ optical system according to claim 6, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320621505.0U CN203606107U (en) | 2013-09-30 | 2013-09-30 | Calibration device for distortion of f-theta optical system |
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| CN201320621505.0U CN203606107U (en) | 2013-09-30 | 2013-09-30 | Calibration device for distortion of f-theta optical system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499433A (en) * | 2013-09-30 | 2014-01-08 | 中国科学院西安光学精密机械研究所 | Distortion calibration device and method for f-theta optical system |
| CN107560832A (en) * | 2017-09-06 | 2018-01-09 | 长春国科精密光学技术有限公司 | Measuring system and the method for measuring d-cinema projectors optical parametric |
| CN114486196A (en) * | 2022-01-27 | 2022-05-13 | 中国科学院长春光学精密机械与物理研究所 | Optical transfer function measuring instrument |
-
2013
- 2013-09-30 CN CN201320621505.0U patent/CN203606107U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499433A (en) * | 2013-09-30 | 2014-01-08 | 中国科学院西安光学精密机械研究所 | Distortion calibration device and method for f-theta optical system |
| CN107560832A (en) * | 2017-09-06 | 2018-01-09 | 长春国科精密光学技术有限公司 | Measuring system and the method for measuring d-cinema projectors optical parametric |
| CN114486196A (en) * | 2022-01-27 | 2022-05-13 | 中国科学院长春光学精密机械与物理研究所 | Optical transfer function measuring instrument |
| CN114486196B (en) * | 2022-01-27 | 2022-11-04 | 中国科学院长春光学精密机械与物理研究所 | Optical transfer function measuring instrument |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20170930 |
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| CF01 | Termination of patent right due to non-payment of annual fee |