CN104539829A - Optical-mechanical structure based on infrared area array detector scanning imaging - Google Patents
Optical-mechanical structure based on infrared area array detector scanning imaging Download PDFInfo
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- CN104539829A CN104539829A CN201410748298.4A CN201410748298A CN104539829A CN 104539829 A CN104539829 A CN 104539829A CN 201410748298 A CN201410748298 A CN 201410748298A CN 104539829 A CN104539829 A CN 104539829A
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Abstract
The invention discloses an optical-mechanical structure based on infrared area array detector scanning imaging. The optical-mechanical structure comprises a pitching pointing mirror 1, an infrared telephoto lens 2, an azimuth compensation swing mirror 3, an infrared imaging lens 4, an infrared area array focal plane detector 5 and an azimuth scanning rotating table 6. By the adoption of the structure, all-dimensional scanning imaging of one single infrared area array detector can be achieved within the range of 360 degrees, it is guaranteed that the blurring effect caused by rotation of the table can be avoided in the infrared image acquiring process, and the advantages of being long in integral time and high in sensitivity of the infrared area array focal plane detector can be fully performed. The optical-mechanical structure based on infrared area array detector scanning imaging has the advantages that all-dimensional scanning is achieved, image blurring and smearing are avoided, and the telescope configuration structure is combined with the secondary imaging objective lens structure.
Description
Technical field:
The present invention relates to infrared detection system, especially, relate to a kind of scanning probe system based on planar array detector.
Background technology:
Second generation infrared warning system abroad began one's study from the end of the seventies in last century, existing more than 30 year so far.Second generation infrared warning system utilizes infrared alignment detector, with the rotating speed scanning imagery of about 1Hz.Due to the restriction of the mechanism of linear array scan imaging, second generation infrared warning systematic function by the short time of integration and low frame rate limit.
Third generation infrared warning system generally adopts area array infrared detector staring imaging, and its time of integration rises to Millisecond by tens Microsecond grades of the second generation, and staring frame frequency can up to 100Hz.Therefore the index such as the alarm precision of third generation infrared warning system and distance significantly will surmount the second generation warning system based on alignment scanning.
In order to pursue farther detection range, generally by longer for the focus design of gazing type infrared imaging system, causing staring visual field less, required alarm scope can not be covered.According to its application scenario, the warning system based on infrared surface array detector generally can be designed to visual field distributed system, and the panorama warning system in 360 degree of orientation is stared warning system by multiple visual field and spliced and combined and form.But adopt multiple detector staring imaging simultaneously, manufacturing cost can be made to increase sharply.Adopt single detector to cover the alarm in 360 degree of orientation, then must introduce scan mechanism.Adopt the imaging of planar array detector continuous rotary that the meeting being difficult to avoid is produced the fuzzy and smear of picture, this is a major defect of planar array detector continuous sweep technology.
Summary of the invention:
The present invention proposes a kind of mechanical-optical setup based on infrared surface array detector scanning imagery, 360 degree of omnibearing imagings can be realized, and image stabilization, there is no smear.The present invention is achieved by the following technical solutions:
Overall mechanical-optical setup points to mirror 1 by pitching, infrared telescope head 2, orientation compensated pendulum mirror 3, infrared imaging camera lens 4, infrared planar focal plane detector 5, azimuth scan turntable 6 forms, and wherein pitching sensing mirror 1, infrared telescope head 2, orientation compensated pendulum mirror 3, infrared imaging camera lens 4 and infrared planar focal plane detector 5 is fixed on azimuth scan turntable 6.Collimated light beam from infinity points to mirror 1 by pitching successively, and infrared telescope head 2, orientation compensated pendulum mirror 3, infrared imaging camera lens 4, is finally imaged onto infrared planar focal plane detector 5.
System in working order time, azimuth scan turntable (6) rotates continuously with stable angular speed, detector carries out integration reading in rotation process, and detector integration forms a two field picture, and repeatedly integration splices composition 360 ° of panoramic pictures after forming multiple image.As shown in Figure 2.There is a small amount of overlapping region the visual field of each integral image, ensures that detection viewing field is without dead angle, finally removes overlapping region when later image signal transacting.
Planar array detector is within a time of integration, the light visual field entering detector must keep stable, otherwise fuzzy smear can be produced, but azimuth scan turntable 6 rotates continuously with angular velocity omega 1, cause the visual field, orientation entering detector also with the speed consecutive variations of ω 1.The present invention addresses this problem by the following method: orientation compensated pendulum mirror 3 in infrared telescope head 2 back reflection light path, and swings in the other direction with angular velocity omega 2, makes the changing inversely of visual field, orientation, final visual field, the orientation change compensating azimuth scan turntable 6 and cause.By telescope optical system characteristic, the directional light incidence meeting parallel light emergence of each angle of visual field, so orientation compensated pendulum mirror 3 swings in parallel light path can not change image quality.The enlargement ratio γ of telescopic system is angular magnification, and the angle of oscillation speed omega 2 of control azimuth compensated pendulum mirror 3 is γ times of ω 1, then can ensure image stabilization in the time of integration, not have smear.
Accompanying drawing illustrates:
Fig. 1 is mechanical-optical setup concrete structure schematic diagram of the present invention.
Fig. 2 is planar array scanning image-forming principle schematic diagram.
Fig. 3 is the schematic diagram of infrared telescope head and compensated pendulum mirror position, orientation in mechanical-optical setup of the present invention.
Embodiment:
Indicated according to the schematic diagram of accompanying drawing 1:
It is an adjustable plane mirror of the angle of pitch that mirror 1 is pointed in pitching, and its effect is the angle of pitch angle value regulating imaging viewing field.Angle of pitch angle value generally regulated before system works, and pitching points to mirror 1 after detector integrates starts, and keeps motionless.
Infrared telescope head 2 is the infrared optical systems without focal power, and its effect is that the collimated light beam of the infinity at its entrance pupil place is compressed to emergent pupil place, and with parallel light emergence.Its angular magnification is γ.Can be obtained by the characteristic of telescope optical system, the ratio of its entrance pupil size and emergent pupil size is also γ.γ is larger, and orientation compensated pendulum mirror 3 size in subsequent optical path is less, is conducive to the swing of motor high accuracy control azimuth compensated pendulum mirror 3.
Orientation compensated pendulum mirror 3 is plane mirrors, and its rotating shaft is vertical with plane mirror normal, rotates backswing campaign by an Electric Machine Control.The effect of orientation compensated pendulum mirror 3 in light path is reflexed in the entrance pupil of infrared imaging camera lens 4 by the collimated light beam from infrared telescope head 2 outgoing to go.System in working order time, azimuth scan turntable 6 rotates continuously with stable angular velocity omega 1, and within a time of integration of detector, orientation compensated pendulum mirror 3 swings in the other direction from zero-bit with the angular speed of ω 2.ω 2 strictly controls as γ with the ratio of ω 1.After a frame integral time terminates, orientation compensated pendulum mirror 3 gets back to zero-bit rapidly, after next frame starts the time of integration, repeats above process.The position of orientation compensated pendulum mirror 3, near the exit pupil position of infrared telescope head 2, can make its mirror size minimum.
The effect of infrared imaging camera lens 4 is imaged onto on infrared planar focal plane detector 5 by the directional light that orientation compensated pendulum mirror 3 reflects.Its structure is twice imaging arrangement, and its emergent pupil is the cold stop of infrared planar focal plane detector 5 Dewar, and its entrance pupil position is at camera lens first Jing Chu.The image quality of overall optical system is the acting in conjunction combining infrared telescope head 2 and infrared imaging camera lens 4.When orientation compensated pendulum mirror 3 diverse location, as long as MTF (optical-modulation transfer function) not obvious decline, and the distortion variable quantity of optical system is within 1%, just can ensure that image planes are stablized.
Claims (3)
1. the mechanical-optical setup based on infrared surface array detector scanning imagery, this structure comprises with lower part: mirror (1) is pointed in pitching, infrared telescope head (2), orientation compensated pendulum mirror (3), infrared imaging camera lens (4), infrared planar focal plane detector (5), azimuth scan turntable (6), it is characterized in that: mirror (1) is pointed in pitching, infrared telescope head (2), orientation compensated pendulum mirror (3), infrared imaging camera lens (4) and infrared planar focal plane detector (5) are fixed on azimuth scan turntable (6), light from object space points to mirror (1) by pitching successively, infrared telescope head (2), orientation compensated pendulum mirror (3), infrared imaging camera lens (4), finally be imaged onto infrared planar focal plane detector (5),
Azimuth scan turntable (6) rotates continuously with stable angular speed, and detector carries out integration reading in rotation process, and detector integration forms a two field picture, and repeatedly integration splices composition 360 ° of panoramic pictures after forming multiple image.
2. the mechanical-optical setup of a kind of continuous sweep infrared imaging system based on face battle array focus planardetector according to claims 1, it is characterized in that infrared telescope head 2 is a set of without focal power optical system, the absolute value of its optical magnification is greater than 1.
3. the digital image stabilization method based on the mechanical-optical setup of a kind of continuous sweep infrared imaging system based on face battle array focus planardetector described in claims 1, it is characterized in that method is as follows: orientation compensated pendulum mirror (3) swings with the direction contrary with azimuth scan turntable (6), the ratio of the rotational angular velocity of angle of oscillation speed and azimuth scan turntable (6) equals the absolute value of the optical magnification of infrared telescope head (2).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410748298.4A CN104539829A (en) | 2014-12-09 | 2014-12-09 | Optical-mechanical structure based on infrared area array detector scanning imaging |
| CN201510145363.9A CN104748860A (en) | 2014-12-09 | 2015-03-31 | Optical machine structure based on infrared area array detector scanning and imaging |
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| CN201410748298.4A CN104539829A (en) | 2014-12-09 | 2014-12-09 | Optical-mechanical structure based on infrared area array detector scanning imaging |
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| CN201410748298.4A Pending CN104539829A (en) | 2014-12-09 | 2014-12-09 | Optical-mechanical structure based on infrared area array detector scanning imaging |
| CN201510145363.9A Pending CN104748860A (en) | 2014-12-09 | 2015-03-31 | Optical machine structure based on infrared area array detector scanning and imaging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105371960A (en) * | 2015-12-05 | 2016-03-02 | 中国航空工业集团公司洛阳电光设备研究所 | Circumferential scanning imaging control method and circumferential scanning imaging system |
| CN105403313A (en) * | 2015-12-05 | 2016-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Infrared area-array scanning imaging system and control method thereof |
| CN105550996A (en) * | 2016-03-02 | 2016-05-04 | 陈小天 | Miniaturized panoramic-viewing optical search and track device |
| CN106842561A (en) * | 2017-03-23 | 2017-06-13 | 昆明物理研究所 | A kind of infrared search-track system stares compensation device |
| CN110515061A (en) * | 2019-09-12 | 2019-11-29 | 北京富吉瑞光电科技有限公司 | A kind of dual sensor object space compensation method and system |
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| CN106646506A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | System and method of infrared area array search track based on high-speed swing mirror |
| CN107819993A (en) * | 2017-12-05 | 2018-03-20 | 杨荣 | A kind of device and method that large area scanning imaging is realized using photodetector array |
| CN111562021B (en) * | 2020-05-22 | 2023-03-03 | 中国科学院上海技术物理研究所 | Thermal infrared imaging system is swept to light small-size airborne large visual field area array pendulum |
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| CN101893757B (en) * | 2009-05-20 | 2012-02-01 | 中国科学院西安光学精密机械研究所 | Middle infrared imaging optical system |
| CN201653553U (en) * | 2010-01-06 | 2010-11-24 | 中国电子科技集团公司第十一研究所 | Infrared panoramic imaging device |
| CN102354053B (en) * | 2011-10-31 | 2014-02-12 | 四川九洲电器集团有限责任公司 | Flyback optical system and method for eliminating image blurring |
| CN102645729B (en) * | 2012-04-24 | 2014-01-08 | 中国电子科技集团公司第十一研究所 | Infrared optical system |
| CN103018901B (en) * | 2012-12-14 | 2016-04-27 | 中国电子科技集团公司第十一研究所 | A kind of Infrared search and track integrated optical imaging system |
| CN204964030U (en) * | 2015-03-31 | 2016-01-13 | 中国科学院上海技术物理研究所 | Opto mechanical structure based on infrared area array detector scanning imagery |
-
2014
- 2014-12-09 CN CN201410748298.4A patent/CN104539829A/en active Pending
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- 2015-03-31 CN CN201510145363.9A patent/CN104748860A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371960A (en) * | 2015-12-05 | 2016-03-02 | 中国航空工业集团公司洛阳电光设备研究所 | Circumferential scanning imaging control method and circumferential scanning imaging system |
| CN105403313A (en) * | 2015-12-05 | 2016-03-16 | 中国航空工业集团公司洛阳电光设备研究所 | Infrared area-array scanning imaging system and control method thereof |
| CN105550996A (en) * | 2016-03-02 | 2016-05-04 | 陈小天 | Miniaturized panoramic-viewing optical search and track device |
| CN106842561A (en) * | 2017-03-23 | 2017-06-13 | 昆明物理研究所 | A kind of infrared search-track system stares compensation device |
| CN106842561B (en) * | 2017-03-23 | 2019-04-30 | 昆明物理研究所 | A kind of infrared search-track system stares compensation device |
| CN110515061A (en) * | 2019-09-12 | 2019-11-29 | 北京富吉瑞光电科技有限公司 | A kind of dual sensor object space compensation method and system |
| CN110515061B (en) * | 2019-09-12 | 2020-08-25 | 北京富吉瑞光电科技有限公司 | Dual-sensor object space compensation method and system |
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| CN104748860A (en) | 2015-07-01 |
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Application publication date: 20150422 |