Low-temperature mounting structure for grating assembly of long-wave infrared Doppler differential interferometer

Abstract

The invention belongs to the field of optical engineering, provides a low-temperature mounting structure for a grating component of a long-wave infrared Doppler differential interferometer, and aims to solve the problems that the mounting pre-tightening force is changed when the temperature load is changed due to mismatching of low-temperature thermal expansion coefficients of different element materials in a traditional long-wave infrared low-temperature optical-mechanical structure. Therefore, the problem that the imaging quality and stability of an optical system are finally influenced by the inclination of interference fringes and the decline of modulation degree is solved. The device comprises a long-wave infrared interferometer support, a grating pressing plate and a grating pressing plate fixing piece. A grating element is installed in the grating pressing plate, the grating pressing plate is tightly attached to and connected with the interferometer support structure, axial positioning and pressing are carried out through a flexible pressing block of the grating pressing plate fixing piece, it is guaranteed that the grating pressing plate reference structure is tightly attached to the interferometer support all the time in the low-temperature state, reliable and effective installation is provided, and the advantages of being simple in structure, convenient to use and the like are achieved. And processing and assembling are convenient.

Description

technical field [0001] The invention relates to a low-temperature flexible installation optical-mechanical structure, in particular to a low-temperature installation structure for a grating component of a long-wave infrared Doppler differential interferometer. Background technique [0002] The long-wave infrared Doppler differential interferometer is used in the field of passive detection of atmospheric wind field. Based on the principle of Doppler frequency shift, the Doppler differential interferometry technology studies the relationship between the frequency shift of atmospheric spectral lines and the velocity of atmospheric motion, and calculates and inverts the state of the atmospheric wind field by measuring the phase of the interferogram. In the field of optical engineering, especially the optical-mechanical system of the long-wave infrared Doppler differential interferometer is very sensitive to environmental conditions. In order to reduce the influence of thermal ba...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a low-temperature installation structure of the grating component of the long-wave infrared Doppler differential interferometer, which solves the problems that the position of the grating element changes due to the mismatch of the thermal expansion coefficients of each part, resulting in the inclination of the interference fringes and the decrease of the modulation degree.

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