Device capable of changing cold diaphragm and imaging wave band of infrared camera

Abstract

The invention discloses a device capable of changing a cold diaphragm and an imaging wave band of an infrared camera, and belongs to the field of photoelectric detection. In order to overcome the defect that the detection capacity of the infrared camera is restricted by normal-temperature iris diaphragms and optical filters, an infrared detector, an aperture diaphragm disc and an optical filter disc are integrated in an infrared camera dewar, and the aperture diaphragm disc and the optical filter disc can rotate through a rotating shaft of the aperture diaphragm disc and a rotating shaft of the optical filter disc. The rotating shaft of the aperture diaphragm disc and the rotating shaft of the optical filter disc are driven by a rotating shaft motor of the aperture diaphragm disc and a rotating shaft motor of the optical filter disc to rotate. Incident light of an infrared telescoping optical system enters the infrared camera dewar through a window of the infrared camera dewar and is imaged on the detector on the focal plane of the infrared camera through the aperture diaphragm disc and the optical filter disc. A heat radiation isolating layer is used for reducing heat radiation of the outer layer of the infrared camera dewar to the focal plane of the infrared camera, the aperture diaphragm disc and the optical filter disc. Diaphragms of different apertures are installed on the aperture diaphragm disc. Optical filers with different wave bands are installed on the optical filter disc.

Description

technical field [0001] The invention belongs to the field of space detection and infrared photoelectric detection of long-distance targets, and in particular relates to a device for variable infrared camera cold stop and imaging band, which meets the requirements of high-performance infrared telescopic optical system for zooming and band of target imaging. Background technique [0002] Cold stop matching is the key to suppressing the thermal background noise of the optical-mechanical structure of the infrared system, and the spectral filter element at room temperature will bring strong thermal background noise to the infrared camera. Therefore, the cold stop and filter of the infrared camera are packaged in a vacuum cryogenic Dewar, and its F number and imaging band are fixed. In some applications, such as zoom imaging of targets by infrared telescopic optical systems, spectral imaging, etc., the F number and imaging band of the system need to be variable. The variable aper...

AI Technical Summary

Problems solved by technology

The variable aperture and filter at room temperature will reduce the sensitivity of the infrared detection system, so it is not suitable for application in the field of infrared detection of long-distance weak targets.

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