Dual view field/two-tone infrared active differential thermal subtraction optical system
An optical system, dual field of view technology, applied in the field of infrared thermal imaging, can solve the problems of optical system staying, no detection rate of two-color confocal system, etc., to reduce false alarm rate, strong environmental adaptability, reduce processing difficulty and The effect of production costs
Inactive Publication Date: 2012-02-15
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
Due to various difficulties, most of the existing domestic optical systems stay in the dual-field-of-view dual-band imaging stage that has not been cooled
[0005] At present, the most advanced optical system among the infrared thermal imaging optical systems reported abroad is the French dual-field dual-band switching imaging optical system. This system does not have the advantage of high detection rate of the two-color confocal system, and the existing data have not And this system has already considered the heat dissipation difference
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[0022] Such as figure 1 As shown, the infrared light wave emitted by the target radiation source is received by the focusing lens group 1, passes through the fixed lens group 2, reaches the wide field of view zoom lens group 3 or the narrow field of view zoom lens group 4, and finally passes through the two-color infrared detector in sequence. The window glass 5 and the diaphragm 6 are imaged on the two-color infrared detector 7, and the infrared radiation target can be identified by image processing and recognition of the two-color infrared detector. The optical system can change the distance between the focusing lens group and the fixed lens group by moving the focusing lens group, which can realize the focusing from a limited distance to infinity; it can be realized by rotating and switching the two zoom lens groups around a fixed axis parallel to the direction of the optical axis. The conversion of the field of view achieves the purpose of switching between target search a...
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The invention relates to a dual view field / two-tone infrared active differential thermal subtraction optical system, particularly relates to an active differential thermal subtraction imaging optical system with cold light diaphragm efficiency approximate to 100 percent and belongs to the field of infrared thermal imaging. The dual view field / two-tone infrared active differential thermal subtraction optical system has a work waveband of 4.4-5.4mum / 7.8-8.8mum, a focal length of 183mm / 61mm and a work temperature of -40DEG C-60DEG C. A wide view field optical system and a narrow view field optical system have the same number F (2.68), share the same two-tone infrared focal plane detector and have cold light diaphragm efficiency approximate to 100 percent. An MWIR (Medium Wave Infrared Ray) and LWIR (Long Wave Infrared Ray) are enabled to be always confocally imaged within a work range by adopting an optical active thermal subtraction mode, and thus a favorable differential thermal subtraction effect is achieved and the environmental suitability is ensured. The dual view field / two-tone infrared active differential thermal subtraction optical system structurally comprises a focusing lens system, a fixed lens system, a wide view field zoom lens system, a narrow view field zoom lens system, two-tone infrared detector window glass, a light diaphragm and a two-tone infrared detector. Various optical surfaces of the dual view field / two-tone infrared active differential thermal subtraction optical system are respectively spherical surfaces which are made of optical materials comprising two normally-used infrared materials, namely germanium and zinc sulfide.
Description
technical field [0001] The invention relates to a dual-field / two-color infrared active adiabatic optical system, which belongs to the field of infrared thermal imaging. Background technique [0002] The dual field of view optical system has two imaging fields of view with different sizes, which is beneficial to realize the target search of large field of view and the target tracking of small field of view. The two-color infrared optical system can acquire target information in two bands at the same time, and suppress complex backgrounds, which can improve the detection ability of targets and reduce the false alarm rate. The two-color confocal optical system does not need a band switching device, the system is simple, the structure is compact, and the detection efficiency is obviously improved. The infrared athermalization optical system can work in complex working environment and meet military requirements. [0003] At present, the athermalization methods of optical system...
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IPC IPC(8): G02B13/14G02B1/00G01J5/08
Inventor 刘智颖付跃刚贾永丹王志坚
Owner CHANGCHUN UNIV OF SCI & TECH