Chinese Optics, Volume. 17, Issue 6, 1489(2024)
Opto-mechanical-thermal integration analysis of Doppler asymmetric spatial heterodyne interferometer
Fig. 4. (a) Interference fringe and (b) fringe number before fine tuning
Fig. 5. (a) Interference fringe and (b) fringe number after fine funning
Fig. 7. Schematic diagram of interference module.
Fig. 8. Structural diagram of interference module. (a) Optical model; (b) interference module physical diagram
Fig. 9. (a) Optical-mechanical model; (b) interference module optical-mechanical structure
Fig. 10. Optical-mechanical finite element model of interference module
Fig. 13. (a) Optical model and (b) opto-mechanical model of imaging optical system
Fig. 14. Optical-mechanical physical picture of imaging optical system
Fig. 15. Imaging optical system and detector relative position monitoring model
Fig. 18. Relationship between Littrow angle and temperature for (a) G1 arm; (b) G2 arm
Fig. 19. Relationship between Littrow wavenumber and temperature for (a) G1 arm; (b) G2 arm
Fig. 20. The variance of interference phase error caused by the drift of the G1 arm and G2 arm at different temperatures
Fig. 21. Relationship between the thermal drift value of the optical path difference and temperature
Fig. 22. Relationship between phase thermal drift caused by optical path difference and temperature thermal drift
Fig. 23. Relationship between wind speed error caused by G1 and G2 thermal drift and temperature
Fig. 24. Relationship between wind speed error caused by optical path difference and temperature
Fig. 27. Magnification of imaging optical system at different temperatures
Fig. 28. Magnification error of the imaging optical system at different temperatures
Fig. 29. Relationship between phase error caused by thermal drift of magnification and temperature
Fig. 30. Thermal analysis cloud map of relative positions of the imaging optical system and the detector
Fig. 31. Variation of the changes of relative position between the imaging optical system and the detector with temperature
Fig. 32. Variation of phase thermal drift caused by the changes of relative position between the imaging optical system and the detector with temperature
Fig. 33. Wind speed error caused by thermal drift of magnification at different temperatures
Fig. 34. Wind speed error caused by the changes of relative position between the imaging optical system and the detector at different temperatures
Table 1. Index parameters of DASH interferometer
View tableView in ArticleTable 1. Index parameters of DASH interferometer
Attribute Parameter Fore-optical system Field of view 5.314°×4° Clear aperture diameter 35 mm Interferometer module Littrow wavelength/nm 557.137 Target line wavelength/nm 557.7 Groove spacing/(gr·mm−1) 600 Littrow angle/(°) 9.6216 Interferometer offset/cm 1.75 Imaging-optical system F/# 7.35 Total length 223.5 mm Magnification 0.5899 Transmissivity 0.93 Detector CCD pixel size/μm 13 CCD pixel number 1024
Table 2. Material characteristics of interferometer
View tableView in ArticleTable 2. Material characteristics of interferometer
Elements Materials Young’s modulus (MPa) Poisson’s ratio Thermal conductivity ( $ \mathrm{W}\cdot {\mathrm{m}\mathrm{m}}^{-1}\cdot {\mathrm{K}}^{-1} $ CET ( $ {10}^{-7}\cdot {\mathrm{K}}^{-1} $ Beam splitting(BS) H-K9LAGT 81450 0.209 0.00075 72 Field-widening Prism(F1,F2) H-LaK2A 94150 0.295 0.00075 80 Gratings(G1,G2) Fused-Silica 74000 0.17 0.00138 5.1 Spacer(W1) H-FK6 70070 0.3 0.00075 131 Spacer(W2) Fused-Silica 740000 0.17 0.00138 5.1 Parallel bias(P1) H-K9LAGT 81450 0.209 0.00075 72 Mechanical shell,Work platform Al alloy2A12 72000 0.3 0.203 230
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Jin-jiang WANG, Lun JIANG, Shou-feng TONG, Hui-yi PEI, Yong CUI, Ming-hang GUO. Opto-mechanical-thermal integration analysis of Doppler asymmetric spatial heterodyne interferometer[J]. Chinese Optics, 2024, 17(6): 1489
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Received: Dec. 23, 2023
Accepted: Mar. 8, 2024
Published Online: Jan. 14, 2025
The Author Email: Shou-feng TONG (tsf1998@sina.com)
