A low temperature radiometer thermal structure

Abstract

The invention discloses a thermal structure for a low-temperature radiometer. According to the thermal structure for the low-temperature radiometer of the invention, a gasket-type heat-conducting bodymade of a polyimide material is adopted; the polyimide material has an ultra-low thermal conductivity coefficient, and therefore, and the thermal conductivity of the polyimide material can satisfy the responsiveness and time constant index of the radiometer; the gasket-type heat-conducting body has considerable mechanical support stress, and therefore, a black body cavity, which is horizontally arranged, will not undergo deformation caused by the vibration of a mechanical refrigerator; the clamping components of thermal structural elements are designed, the thermal structural elements are connected with each other through screws, and therefore, heat conduction at all positions except the outer edge of the heat-conducting body can be avoided; the screws are used to connect the thermal structure, so that the maintenance and replacement of the thermal structure elements and the adjustment of the sensitivity, time constant, diaphragm aperture diameter and other parameters of the low-temperature radiometer can be facilitated; and a support heat sink with a height adjustable function is designed, and therefore, the adjustment and alignment of an optical axis during an experimental and assembly process in a later stage can be facilitated.

Description

technical field [0001] The invention relates to a low temperature radiometer thermal structure. Background technique [0002] The low temperature radiometer uses the electricity substitution measurement principle under the low temperature superconducting, traces the optical radiation measurement to the electrical parameter measurement that can be accurately measured, and obtains the optical power measurement benchmark of the absolute power value of the optical radiation, and the measurement uncertainty reaches 10 -5 The order of magnitude is currently the highest benchmark for measuring optical power in the world, and it has played a fundamental and important role in the measurement of optical radiation in the fields of national defense and military scientific research such as "high score", "earth observation and navigation", and "guidance". [0003] Since the 1980s, the National Institute of Physics (NPL), the National Institute of Metrology (NIST) and the German Federal In...

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Problems solved by technology

[0010] (1) The mosquito-repellent incense structure is mainly connected with the heat sink of the outer ring by low-temperature glue and its own gravity. When it is applied in the horizontal direction, the supporting force is not enough, and it is prone to vibration deformation and displacement of the optical axis; (2) The use of seamless welding and other technologies causes The components cannot be disassembled, which is not conducive to later maintenance and component replacement; (3) The position of the black body cavity cannot be adjusted, which is not conducive to the alignment of the optical axis

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