E-mail Alert
RSS
| Citation: |
Qinghao Ye, Tong Jiang, Haishan Dai, et al. Influence of thermal-vacuum environment on the recovered spectrum of spatial heterodyne spectrometer[J]. Opto-Electronic Engineering, 2017, 44(7): 710-718. doi: 10.3969/j.issn.1003-501X.2017.07.007
|
Influence of thermal-vacuum environment on the recovered spectrum of spatial heterodyne spectrometer
-
Abstract
Thermal-vacuum environment adaptability is one of the key performances of space optical instruments, especially for hyper-spectral instrument, and spatial heterodyne spectrometer (SHS) should provide high spectral stability for the detection of atmosphere CO2. Based on the research of the spatial heterodyne interference principle, simulation test in thermal-vacuum environment and quantitative analyses are carried out. The relationship among environment changes and the divergence half-angle of collimating lens, Littrow wavelength of field widened interferometer, different defocusing amount and pantograph ratio of imaging lens are analyzed. In order to verify the theoretical analysis, thermal-vacuum experiment is performed. The results show that the spectral deviation and profile are matched with theoretical analysis, and spectral stability is less than ±0.01 nm under the temperature from 19 ℃ to 21.2 ℃ by the substrates made of fused Silica (Corning 7980 0F). Quantitative analyses provide theoretical basis for the thermal control requirement and Littrow wavelength selection in normal atmospheric pressure. -
-
References
[1] Harlander J M. Spatial heterodyne spectroscopy: interferometric performance at any wavelength without scanning[D]. USA: University of Wisconsin-Madison, 1991. https://www.researchgate.net/publication/259014093_Spatial_Heterodyne_Spectroscopy_Interferometric_Performance_at_any_Wavelength_Without_Scanning [2] Smith B W, Harlander J M. Imaging spatial heterodyne spec-troscopy: theory and practice[J]. Proceedings of SPIE, 1999, 3698: 925–931. doi: 10.1117/12.354497 [3] Harlander J M, Roesler F L, Cardon J G, et al. SHIMMER: a spatial heterodyne spectrometer for remote sensing of Earth's middle atmosphere[J]. Applied Optics, 2002, 41(7): 1343–1352. doi: 10.1364/AO.41.001343 [4] Englert C R, Stevens M H, Siskind D E, et al. Spatial hetero-dyne imager for mesospheric radicals on STPSat-1[J]. Journal of Geophysical Research, 2010, 115(D20): D20306. [5] Lin Yunlong, Shepherd G, Solheim B, et al. Introduction to spatial heterodyne observations of water (SHOW) project and its instrument development[C]. ITSC-ⅩⅣ Proceedings, Beijing, China, 2005. https://cimss.ssec.wisc.edu/itwg/itsc/itsc14/proceedings/B48_Lin.pdf [6] Doe R A, Watchorn S. Climate-monitoring CubeSat mission (CM2): a project for global mesopause temperature sensing[J]. Proceedings of SPIE, 2011, 8153: 81530Q. doi: 10.1117/12.894460 [7] 施海亮, 熊伟, 邹铭敏, 等.空间外差光谱仪定标方法研究[J].光谱学与光谱分析, 2010, 30(6): 1683–1687. Shi Hailiang, Xiong Wei, Zou Mingmin, et al. Study on calibra-tion method of spatial heterodyne spectrometer[J]. Spectroscopy and Spectral Analysis, 2010, 30(6): 1683–1687. [8] 罗海燕, 施海亮, 李双, 等.空间外差光谱仪干涉仪组件的容差分析[J].光学学报, 2014, 34(3): 0330002. Luo Haiyan, Shi Hailiang, Li Shuang, et al. Study on the performance indexes of spatial heterodyne spectrometer influenced by elements tolerances[J]. Acta Optica Sinica, 2014, 34(3): 0330002. [9] 施海亮, 李志伟, 罗海燕, 等.超光谱大气CO2监测仪光谱定标误差修正[J].光谱学与光谱分析, 2016, 36(7): 2296–2299. Shi Hailiang, Li Zhiwei, Luo Haiyan, et al. Error correction of spectral calibration for hyper-spectral atmosphere CO2 monitoring instrument[J]. Spectroscopy and Spectral Analysis, 2016, 36(7): 2296–2299. [10] 叶擎昊, 施海亮, 熊伟.空间外差光谱仪数据盲元误差修正[J].光电工程, 2015, 42(12): 25–29. doi: 10.3969/j.issn.1003-501X.2015.12.005 Ye Qinghao, Shi Hailiang, Xiong Wei. Blind-data error correction of spatial heterodyne spectrometer[J]. Opto-Electronic Engineering, 2015, 42(12): 25–29. doi: 10.3969/j.issn.1003-501X.2015.12.005 -
Overview
Abstract: Spatial heterodyne Spectroscopy is an interferometric technique to achieve many hyper-spectral detections that have been developed for several decades by J. M. Harlander, F. L. Roesler et al. In particular, passive hyper-spectral spatial heterodyne spectrometer (SHS) is significant instrument for space applications to measure colume densities of trace gases (CO2, CH4, CO), mesospheric OH density, global chlorophy Ⅱ fluorescence and so on from recent information and progress report. Hence, the recovered spectrum of SHS also depends on its thermal-vacuum environment. Thermal-vacuum environment adaptability is one of the key performances for hyper-spectral instrument, and SHS should provide high spectral stability especially for space detection of atmospheric trace gases. In this case, the spectral band spans 757 nm~771 nm with a spectral resolution of ~ 0.03 nm, even though an extended source (extent of ~73 mrad, entrance diameter of 21 mm) is used. This channel for Oxygen (O2) measurements is intended to investigate influence on Carbon Dioxide (CO2) column abundance including atmospheric parameters and surface height. Based on the research of the spatial heterodyne interference principle, simulation test in thermal-vacuum environment and quantitative analyses are carried out. The relationship between environmental changes and the divergence half-angle of collimating lens, Littrow wavelength of field widened interferometer, different defocusing amounts and pantograph ratio of imaging lens are analyzed. With low thermal expansion coefficient of 5.7×10-7/K and high thermal refraction index of 9.2×10-6/K, Fused Silica is well suited for grating substrates with high groove density, but it is not necessarily the best choice for beamsplliter and field widened wedge. In order to verify the theoretical analyses and determine if SHS performance would achieve its science goals, thermal-vacuum experiment by CS-800 and integrating sphere light source is performed at Key Laboratory of Optical Calibration and Characterization (KLOCC) of Chinese Academy of Sciences (CAS). The results, especially for relationship between recovered spectral profiles and different out-of-focus amounts due to optical degradation of interferogram modulation in the harsh space environment, show that the relative spectral intensity deviation and spectral profile are matched with theoretical analysis, and spectral stability is less than ±0.01 nm under the temperature from 19 ℃ to 21.2 ℃ by the substrates made of Fused Silica (Corning 7980 0F). Quantitative analysis provides theoretical basis for the thermal control requirement and Littrow wavelength selection in normal atmospheric pressure. SHS is well suited for low light and high spectral resolution detection, but active thermal controller, calibration and correction under on-orbit conditions are necessary for space applicaitions.
-
Access History
Figures(10)
Tables(3)
Article Metrics
Export File
Citation
Qinghao Ye, Tong Jiang, Haishan Dai, et al. Influence of thermal-vacuum environment on the recovered spectrum of spatial heterodyne spectrometer[J]. Opto-Electronic Engineering, 2017, 44(7): 710-718. doi: 10.3969/j.issn.1003-501X.2017.07.007
Format
Content
DownLoad:
-
Figure 1.
Schematic diagram of O2-A waveband spectrometer.
-
Figure 2.
Exiting wave fronts of other wavelengths.
-
Figure 3.
Ray trace of the relay collimating lens (Substrate: SiLiCa).
-
Figure 4.
Relationship curve between solid angle and modulation degree of fringe.
-
Figure 5.
The varition between source types and shift of Littrow wavelength.
-
Figure 6.
(a) Relationship between temperature and Littrow wavelength in normal pressure. (b) Temperature effect on Littrow wavelength (FW and grating).
-
Figure 7.
Refractive index change in normal pressure and vacuum environment.
-
Figure 8.
MTF curves of imaging lens at different pressures.
-
Figure 9.
Shematic diagram of experiment at layout.
-
Figure 10.
(a) Original interferogram at different defocusing. (b) The 300th-row of original interferograms. (c) Recovered spectrums of the 300th-row from original interferograms.
