| Citation: | WANG Jin-jiang, JIANG Lun, TONG Shou-feng, PEI Hui-yi, CUI Yong, GUO Ming-hang. Opto-mechanical-thermal integration analysis of Doppler asymmetric spatial heterodyne interferometer[J]. Chinese Optics, 2024, 17(6): 1489-1511. doi: 10.37188/CO.2023-0234
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In order to improve the detection accuracy of Doppler asymmetric spatial heterodyne (DASH) interferometer in harsh temperatures, an opto-mechanical-thermal integration analysis is carried out. Firstly, the correlation between the interference phase and temperature is established according to the working principle and the phase algorithm of the interferometer. Secondly, the optical mechanical thermal analysis model and thermal deformation data acquisition model are designed. The deformation data of the interference module and the imaging optical system at different temperatures are given by temperature load simulation analysis, and the phase error caused by thermal deformation is obtained by fitting. Finally, based on the wind speed error caused by thermal deformation of each component, a reasonable temperature control scheme is proposed. The results show that the interference module occupies the main cause, the temperature must be controlled within (20±0.05) °C, and the temperature control should be carried out for the temperature sensitive parts, and the wind speed error caused by the part is 3.8 m/s. The thermal drift between the magnification of the imaging optical system and the thermal drift of the relative position between the imaging optical system and the detector should occupy the secondary cause, which should be controlled within (20±2) °C, and the wind speed error caused by the part is 3.05 m/s. In summary, the wind measurement error caused by interference module, imaging optical system, and the relative position between the imaging optical system and the detector can be controlled within 6.85 m/s. The analysis and temperature control schemes presented in this paper can provide theoretical basis for DASH interferometer engineering applications.
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