Design Of A Kind Of Infrared Detector Components Based On Triplicate View Field

Infrared thermal imaging is an important branch of night vision technology, it is the key aspect in development of optical-electrical technology at present. Compared with visible light and low-light level, infrared thermal imaging can overcome disadvantage of operator self-exposed caused by artificial illumination of active night vision device, as well as depending upon completely natural light of passive low-light level night vision device. Also it has some ability to penetrate smoke, fog, haze, snow, etc., and with the characteristics of identification camouflage target, not to be interfered by strong light and flash in battlefield, as well as target detection range is very far, it is the one of the interesting aspect in the photoelectric detection technology field.Forward Looking Infrared Assembly (FLIA) is key component of airborne optical-electrical device, It is usually used together with visible light TV system, laser ranging for detecting and recognizing. The optical design, electrical and general construction of a forward looking infrared assembly with switchable three fields of view is researched based on320x240detector in this paper. The imaging principle of infrared system, selection of infrared detector and key technology of forward looking infrared assembly is introduced. The factors affecting infrared imaging.is analyzed. Advantage and disadvantage of multi-field of view is Compared. A kind of method to achieve optical path change of three fields of view.by using fixed objective and switching optical assembly is realiesd, and thermal difference dispelled is adopted in optical design. The direct current motor control system to mechanical positioning control system is achived based on AT89S52single chip processor and AS5045rotary coder, and identity of optical axis of product is realised. Optical axis stability of product in three operation position shall be assured by using feedback information of angle measuremented from rotary coder and mechanical positioning. This design can meet the development requirement by test performance of product.