A diaphragm and an optical instrument with the same

Abstract

The embodiment of the present invention discloses a diaphragm, the diaphragm has a base, a semiconductor cooling chip is embedded in the base, the first surface of the base is processed into a polished spherical surface, and the polished spherical surface is coated with reflective A film, on the second surface of the substrate, is provided with connecting means for connecting with the surface driver. Semiconductor refrigeration is carried out on the basis of polishing and coating the reflective surface of the diaphragm, which reduces the temperature and emissivity of the reflective surface of the diaphragm, and reduces the influence of the radiation of the diaphragm itself on the detector; The combination of motors controls the surface shape and position of the diaphragm, which solves the problem that the variable aperture infrared system cannot use the diaphragm to suppress stray radiation; the base of the diaphragm is made of carbon fiber composite material, which can be used with only a small driving force The curvature of the reflective surface of the diaphragm changes greatly, and at the same time, the efficiency of semiconductor refrigeration is improved by taking advantage of its good thermal conductivity. The invention also provides an optical instrument.

Description

technical field [0001] The invention relates to the field of optical technology, and relates to an aperture and an optical instrument with the aperture. Background technique [0002] In order to improve the detection sensitivity of the infrared imaging system, it is necessary to carry out cold diaphragm matching design to suppress infrared stray radiation, but in the case of strictly limited optical system size, it is impossible to achieve 100% cold diaphragm efficiency, and an external diaphragm needs to be introduced . The solid angle of the cold stop of the detector is greater than the solid angle of the stop, the stop surface can be seen by the detector, the stop is at the ambient temperature, and the detector is at the working temperature of about 77K in the Dewar bottle, so compared to the detector, the light The diaphragm is a high-temperature radiation source, and the surface of the diaphragm will reflect the external heat radiation to the detector. The stray radiat...

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Problems solved by technology

[0003] Among the existing infrared diaphragms, only the diaphragms of the fixed position and fixed relative aperture optical system at room temperature are designed and optimized, such as spherical polished and coated diaphragms, etc., although the emissivity of the diaphragm itself is suppressed, but The temperature of the diaphragm is not controlled, and its own radiation is still high. At the same time, for example, for a large-aperture coaxial catadioptric zoom system, its relative aperture is constantly changing during the zooming process, resulting in the position and curvature of the diaphragm. The movement of the system diaphragm position changes, and the conventional diaphragm cannot meet this demand

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