OPTICAL INFRARED RANGE SYSTEM WITH ACTIVE FOCUSING FUNCTION
Annotation
Methods and means of active focusing for optical systems of IR spectral range, used to retain the spatial and energy resolution of the optical-electronic equipment in operating conditions are examined. Active focusing using the built-in test emitter located in the intermediate image plane of the IR optical system is proposed. A criterion of focusing based on an analysis of output signals of multi-element photo-receiving device is considered, sensitivity of the criterion to defocusing value of the optical system is numerically estimated. High sensitivity of the proposed focusing method and technical feasibility of the focusing tools in an optical system used in combination with serial samples of medium-wave and long-wave IR matrix photodetectors with a cooled aperture diaphragm are demonstrated. It is recommended to use the developed method and focusing tools as a part of onboard optoelectronic observation equipment operated in automatic mode in a wide temperature range.
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