CN202974297U - Linear array CCD (Charge Coupled Device) camera two-way modulation transfer function testing device - Google Patents
Linear array CCD (Charge Coupled Device) camera two-way modulation transfer function testing device Download PDFInfo
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- CN202974297U CN202974297U CN 201220542710 CN201220542710U CN202974297U CN 202974297 U CN202974297 U CN 202974297U CN 201220542710 CN201220542710 CN 201220542710 CN 201220542710 U CN201220542710 U CN 201220542710U CN 202974297 U CN202974297 U CN 202974297U
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- modulation transfer
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Abstract
The utility model relates to a linear array CCD (Charge Coupled Device) camera two-way modulation transfer function testing device which comprises a light source, a target plate, a collimator tube and high-accuracy angular rate rotary table, wherein a camera to be tested is arranged on the high-accuracy angular rate rotary table; the target plate, the collimator tube and the camera to be tested are sequentially arranged on the emitting light path of the light source; and the target plate is provided with target plate horizontal stripes and target plate longitudinal stripes which are mutually perpendicular to the target plate horizontal stripes. The linear array CCD camera two-way modulation transfer function testing device provided by the utility model can be used for directly simultaneously testing the full-system MTF (Modulation Transfer Function) two-way system transfer functions and is wide in application range and convenient to operate.
Description
Technical field
The utility model belongs to optical field, relates to the two-way modulation transfer function proving installation of a kind of optical camera, relates in particular to the two-way modulation transfer function proving installation of a kind of linear array CCD camera.
Background technology
Line array CCD is a kind of sensor of widespread use in remote optical sensing, sweeps with relative the pushing away of target the image that obtains target by camera, is the important technical scheme of high-resolution optical remote sensing observation.linear array detector is owing to only gathering in one direction optical signalling, the machine system modulation transfer function (MTF) of traditional linear array CCD camera is to adopt to test with the parallel light tube of channel(l)ed plate, orientation by manual minute adjustment channel(l)ed plate makes striped perpendicular to linear array detector, and guarantee that the striped size just is pressed on a pixel, the just linear array detector direction MTF that records, can't record and push away the MTF that sweeps on direction, with this as machine system MTF, this evaluation to system's picture element is incomplete, the optical system (meridian direction and sagitta of arc direction focal plane have the system of certain dislocation) to there being certain astigmatism particularly, when linear array direction MTF is maximum, push away and sweep that on direction, MTF has descended comparatively serious.
The utility model content
Can not directly to measure pushing away of CCD camera in background technology in the laboratory and sweep the not enough of direction modulation transfer function and need manual accurate adjustment could obtain the technical matterss such as inconvenience of linear array direction modulation transfer function in order to solve, the utility model provides a kind of system's biography function, two-way modulation transfer function proving installation of linear array CCD camera applied widely and convenient operation that can directly record simultaneously total system MTF both direction.
Technical solution of the present utility model is: the utility model provides a kind of linear array CCD camera two-way modulation transfer function proving installation, and its special character is: the two-way modulation transfer function proving installation of described linear array CCD camera comprises light source, Target Board, parallel light tube and high precision angular speed turntable; Camera to be tested is arranged on high precision angular speed turntable; Described Target Board, parallel light tube and camera to be tested are successively set on the emitting light path of light source; Be provided with on described Target Board the Target Board horizontal stripe and with the orthogonal Target Board nicking of Target Board horizontal stripe.
Above-mentioned Target Board horizontal stripe is 5 groups at least; Described every group comprises 3 pairs of stripeds at least; Interval between described horizontal stripe group is lni=(p+i/n) * (l+l '); Wherein:
Described p is arbitrary integer;
Described i is more than or equal to 1 integer less than or equal to n;
Described n is the group number of Target Board horizontal stripe;
Described l is the width of every stripe on Target Board;
Described l ' is the interval between striped and striped on Target Board.
Above-mentioned Target Board nicking is 5 groups at least; Described every group comprises 3 pairs of stripeds at least; Interval between described horizontal stripe group is lmi=(k+j/m) * (l+l ');
Described k is arbitrary integer;
Described j is more than or equal to 1 integer less than or equal to m;
Described m is the group number of Target Board nicking;
Described l is the width of every stripe on Target Board;
Described l ' is the interval between striped and striped on Target Board.
On above-mentioned Target Board, the width l of every stripe satisfies l=f '
p/ f '
cD;
Wherein:
Described f '
pIt is the focal length of parallel light tube;
Described f '
cIt is the focal length of tested camera;
Described d is tested magazine CCD pixel dimension.
On above-mentioned Target Board on the width l of every stripe and Target Board striped equate with interval l ' between striped.
The utility model provides a kind of linear array CCD camera two-way modulation transfer function proving installation, tested line-scan digital camera is placed on high-accuracy angular speed turntable, to the stripe target plate push-scanning image on focal surface of collimator tube, the reading images DN value of one group of light and shade striped the most clearly on both direction anyhow respectively, calculating namely obtains the two-way modulation transfer function of machine system.The utility model has solved to push away in the background technology sweeps the technical matters that the direction modulation transfer function can not be measured and the linear array direction needs manual accurate adjustment to measure, and has the following advantages:
1, the system that adopts device provided by the utility model can directly record simultaneously total system MTF both direction passes letter; 2, the utility model is applicable to single linear CCD camera system, multi-thread array CCD camera, single line battle array TDI-CCD camera system, multi-thread battle array TDI-CCD camera, single line battle array cmos sensor camera, multi-thread battle array cmos sensor camera and with the machine system MTF test of the camera of other types Single array detector; 3, the utility model by after changing channel(l)ed plate, is applicable to the optical camera machine system MTF test of different focal and different Pixel sizes; 4, this proving installation is realized simple, convenient, time saving and energy saving.
Description of drawings
Fig. 1 is the structural representation of proving installation provided by the utility model;
Fig. 2 is the schematic diagram of the structure of the Target Board that adopts of the utility model;
Fig. 3 is the structural representation of nicking set on the Target Board that adopts of the utility model;
Fig. 4 is the structural representation of horizontal stripe set on the Target Board that adopts of the utility model;
Wherein:
The 1-light source; The 2-Target Board; The 3-parallel light tube; The tested camera of 4-; 5-high precision angular speed/position turntable; 2.1-Target Board nicking; 2.2-Target Board horizontal stripe; 2.1.1-i group nicking group; 2.1.2-the perpendicular group of i+1 nicking group; 2.2.1-i group horizontal stripe group; 2.2.2-i+1 group horizontal stripe group.
Embodiment
The utility model principle: what adopt that the linear array CCD camera single frames of the technical scheme of line array CCD push-scanning image obtains is the image of target a row or column, target is pushed away to sweep just can obtain the target two dimensional image after taking multiframe.A Target Board in the channel(l)ed plate displacement classic method that has simultaneously horizontal stripe and a nicking is set, the line-scan digital camera system is placed on turntable, rotation by turntable makes target and camera form relative motion, the capable migration period (inverse of line frequency) and target travel rate-matched that keep camera, by the DN value of the light and shade of the both direction anyhow striped in the reading fringe picture, calculate respectively the MTF of both direction.
The two-way modulation transfer function proving installation of linear array CCD camera comprises light source 1, Target Board 2, parallel light tube 3 and high precision angular speed turntable 5; Camera 4 to be tested is arranged on high precision angular speed turntable 5; Target Board 2, parallel light tube 3 and camera to be tested 4 are successively set on the emitting light path of light source 1; Be provided with on Target Board 2 Target Board horizontal stripe 2.2 and with the orthogonal Target Board nicking 2.1 of Target Board horizontal stripe 2.2.
Referring to Fig. 2, Fig. 3 and Fig. 4, Target Board horizontal stripe 2.2 is 5 groups at least; Every group comprises 3 pairs of stripeds at least; For example, i group horizontal stripe group 2.2.1 and i+1 group horizontal stripe group 2.2.2.The Target Board nicking is 5 groups at least; Every group comprises 3 pairs of stripeds at least; For example i group nicking group 2.1.1 and i+1 erect group nicking group 2.1.2.
Camera 4 to be tested is arranged on high precision angular speed turntable 5, high precision angular speed turntable 5 rotations are vertical with the earth, installed surface is parallel with the earth, and camera 4 detector linear array directions to be tested are parallel with high precision angular speed turntable 5 turning axles, the as close as possible turntable turning axle of front nodal point and center of gravity;
Target Board is arranged on the focal plane of parallel light tube, the axis of parallel light tube is parallel with the camera optical axis and on a height, bore is 2 ~ 5 times of camera bores, focal length is 5 ~ 10 times of camera focus, the nicking of Target Board is parallel with the linear array direction of detector, horizontal stripe and detector linear array perpendicular direction.
Turntable speed angular velocity uncertainty is better than 0.5%, turntable speed omega and camera line frequency hp, satisfy hp=d/ (f '
cω);
If the focal distance f of parallel light tube '
p, the focal distance f of tested camera '
c, CCD pixel dimension d, the development target plate, the channel(l)ed plate width of fringe is
Horizontal stripe arranges n(〉=5) group, nicking arranges m(〉=5) group, and every group arranges k(〉=3) to striped, fringe spacing l '=l, interval between the horizontal stripe group
(wherein p is integer), interval between the nicking group
(wherein k is integer).
If the turntable speed omega, camera line frequency hp is,
Specific works process of the present utility model is:
Obtain with the two-dimentional picture rich in detail of the Target Board of striped anyhow
(ⅰ) settle high precision angular speed turntable on a shock insulation ground, regulate the turntable table-surface level, turning axle is vertical with the earth;
(ⅱ) tested camera is arranged on turntable, the camera level is installed, and the line array CCD direction is parallel with the turntable turning axle, and guarantees that as far as possible front nodal point and center of gravity are near the turntable turning axle;
(ⅲ) with the parallel light tube horizontal setting, height is consistent with camera optical axis height, and Way out is aimed at turret axis;
(ⅳ) Target Board is placed on the focal plane of parallel light tube, the stripe direction of Target Board and camera detector direction coupling, and using light source illumination;
(ⅴ) turntable and camera start work, arrange turntable angular velocity and camera line frequency, document image; Calculate respectively the linear array direction and push away the MTF that sweeps direction
(ⅰ) choose in image horizontal stripe direction light and shade striped the most clearly, read the mean value of bright fringe
And the mean value of dark fringe
Calculate linear array direction MTF
h
Annotate: be the multiplying power relation of π/4 between modulation transfer function and compare transfer function CTF
(ⅱ) choose in image nicking direction light and shade striped the most clearly, read the mean value of bright fringe
And the mean value of dark fringe
Calculate to push away and sweep direction MTF
s
Annotate: be 0.637 multiplying power relation between dynamic modulation transfer function and static modulation transfer function.
Claims (1)
1. two-way modulation transfer function proving installation of linear array CCD camera, it is characterized in that: the two-way modulation transfer function proving installation of described linear array CCD camera comprises light source, Target Board, parallel light tube and high precision angular speed turntable; Camera to be tested is arranged on high precision angular speed turntable; Described Target Board, parallel light tube and camera to be tested are successively set on the emitting light path of light source; Be provided with on described Target Board the Target Board horizontal stripe and with the orthogonal Target Board nicking of Target Board horizontal stripe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220542710 CN202974297U (en) | 2012-10-22 | 2012-10-22 | Linear array CCD (Charge Coupled Device) camera two-way modulation transfer function testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220542710 CN202974297U (en) | 2012-10-22 | 2012-10-22 | Linear array CCD (Charge Coupled Device) camera two-way modulation transfer function testing device |
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| CN202974297U true CN202974297U (en) | 2013-06-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914320A (en) * | 2012-10-22 | 2013-02-06 | 中国科学院西安光学精密机械研究所 | Linear array CCD (Charge Coupled Device) camera bidirectional modulation transfer function testing device and method |
| CN105823622A (en) * | 2015-01-09 | 2016-08-03 | 哈尔滨新光光电科技有限公司 | Oscillating mirror-based MTF measurement device |
| CN110455499A (en) * | 2019-07-25 | 2019-11-15 | 中国科学院西安光学精密机械研究所 | A kind of image camera MTF test device and method |
| CN110689537A (en) * | 2019-10-08 | 2020-01-14 | 凌云光技术集团有限责任公司 | Method and system for judging whether line-scan camera is used for acquiring images at constant speed |
| WO2020107586A1 (en) * | 2018-11-26 | 2020-06-04 | 歌尔股份有限公司 | Detection system and method for parameters of optical module |
| RU2809922C1 (en) * | 2023-06-16 | 2023-12-19 | Евгений Викторович Чаусов | Method for estimating linear resolution in terror of digital optical-electronic earth remote sensing systems based on use of adaptive threshold contrast index |
-
2012
- 2012-10-22 CN CN 201220542710 patent/CN202974297U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914320A (en) * | 2012-10-22 | 2013-02-06 | 中国科学院西安光学精密机械研究所 | Linear array CCD (Charge Coupled Device) camera bidirectional modulation transfer function testing device and method |
| CN102914320B (en) * | 2012-10-22 | 2015-07-15 | 中国科学院西安光学精密机械研究所 | Linear array CCD (Charge Coupled Device) camera bidirectional modulation transfer function testing device and method |
| CN105823622A (en) * | 2015-01-09 | 2016-08-03 | 哈尔滨新光光电科技有限公司 | Oscillating mirror-based MTF measurement device |
| CN105823622B (en) * | 2015-01-09 | 2019-10-15 | 哈尔滨新光光电科技股份有限公司 | A kind of full filed MTF measuring device based on pendulum mirror |
| WO2020107586A1 (en) * | 2018-11-26 | 2020-06-04 | 歌尔股份有限公司 | Detection system and method for parameters of optical module |
| CN110455499A (en) * | 2019-07-25 | 2019-11-15 | 中国科学院西安光学精密机械研究所 | A kind of image camera MTF test device and method |
| CN110455499B (en) * | 2019-07-25 | 2020-09-29 | 中国科学院西安光学精密机械研究所 | Imaging camera MTF testing device and method |
| CN110689537A (en) * | 2019-10-08 | 2020-01-14 | 凌云光技术集团有限责任公司 | Method and system for judging whether line-scan camera is used for acquiring images at constant speed |
| CN110689537B (en) * | 2019-10-08 | 2022-05-03 | 凌云光技术股份有限公司 | Method and system for judging whether line-scan camera is used for acquiring images at constant speed |
| RU2809922C1 (en) * | 2023-06-16 | 2023-12-19 | Евгений Викторович Чаусов | Method for estimating linear resolution in terror of digital optical-electronic earth remote sensing systems based on use of adaptive threshold contrast index |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130605 Termination date: 20151022 |
|
| EXPY | Termination of patent right or utility model |