TARGET OPTICAL-ELECTRONIC SEARCH AND TRACKING SYSTEM THERMAL IMAGING CHANNEL AUTO-FOCUSING METHOD Russian patent published in 2019 - IPC G02B7/09 G02B7/00 G12B7/00 G01D3/28 G01J5/60 

FIELD: optics.

SUBSTANCE: invention relates to the optical-electronic devices autofocusing methods with high image quality in a wide range of operating temperatures. Optoelectronic search and target tracking system thermal channel autofocusing method, during which determining the focusing lens movement magnitude functional dependence on the current operating temperature, next, by the temperature sensor signal moving the optical-electronic system lens focusing lens to the corresponding to the current operating temperature position, at that, placing the temperature sensor inside the lens body, experimentally determining the focusing lens movement magnitude functional dependence on the lens current operating temperature, on one or more samples for the thermal imaging channel operation starting and ending, taking into account of the lens depth of field and the heating degree, next, performing the obtained functions approximation, from which determining corresponding to the best image quality in the whole range of operating temperatures resulting function and writing it into the control unit memory, during the optical-electronic search and tracking system thermal channel operation, in accordance with the resulting function with a control signal from the control unit by the lens temperature sensor signal the electric drive moves the focusing lens to the corresponding to the current operating temperature position. In addition, the method involves manual focusing, and for the particular optical-electronic system production and technological differences elimination, in front of the thermal imaging channel the thermal imaging collimator is installed, at that, the focusing lens in the optical-electronic system is set to corresponding by the resulting function the external temperature position, and, if the image is poor, moving the focusing lens until the required image quality achievement, determining the focusing lens new position, calculating the difference between the focusing lens former and the new position, and shifting the resulting functional relationship along the focusing lens movement axis by the amount of correction, and in the future, this sample automatic focusing will be carried out with this correction.

EFFECT: development of the autofocusing method, that is the target optical-electronic search and tracking system thermal imaging channel thermal compensation, which ensures the optical-electronic system high-quality adjustment depending on the temperature effect, which temperature varies according to a certain law in relation to the ambient temperature, and obtaining a good image quality over the entire range of operating temperatures.

3 cl, 2 dwg