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Wang H.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Wang H.,University of Chinese Academy of Sciences | Liu X.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Feng Y.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Bai Q.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science
Guangxue Xuebao/Acta Optica Sinica | Year: 2013

The principle of measuring thermospheric wind and temperature by Fabry-Perot interferometer (FPI) is elaborated, the transfer function of FPI and the analytical response expression to the incident line is studied. Referring to the basic principle of traditional wind and temperature retrieval method with FPI, a new matrix reduction technique is proposed. This technique is based on the decompose and approximate mathematics to obtain the matrix form of analytical response expression, then a least-squares technique is employed to get the thermospheric wind and temperature. Simulation results show that when the guessed wind is less than 150 m/s and the guessed temperature is less than 80 K, the error range is ±3 m/s for wind and ±10 K for temperature. The matrix technique not only retains the accuracy of a full Fourier Series Representation method, but also avoids instrument calibration and wavelength translation, which makes it simple and fast. Source


Fei X.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Fei X.,University of Chinese Academy of Sciences | Feng Y.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Bai Q.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Doppler asymmetric spatial heterodyne spectroscopy (DASH) is a new technology for measuring upper atmospheric winds by observing the Doppler shift of atmospheric emission lines from a satellite using a limb viewing geometry. The real-fringe DASH interferometer is a modification of conventional DASH interferometer; it keeps the advantages of the conventional one. Moreover, this interferometer will not need exit optics to image the superposed fringes onto the detector; it will be more compact and lightweight, making it suitable for space-based platforms. We describe the concept of the new interferometer and present the exact expression of spatial frequency and phase of the interferogram. We also describe design and simulation of a real-fringe DASH interferometer for observation of the O [1D] 630nm emission. The simulation results agree with the theory. © 2015 SPIE. Source


Feng Y.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Bai Q.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Wang Y.,Chinese Academy of Sciences | Hu B.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Wang S.,Changchun University of Science and Technology
Guangxue Xuebao/Acta Optica Sinica | Year: 2012

It is one of the most important methods to use field-widened prism to increase the throughput or sensitivity for spatial heterodyne spectrometer. This paper borrows idea from the basic principle of traditional Fourier transform spectrometer with field-widened and combines the characteristics of spatial heterodyne spectroscopy, a method based on numerical reduction to design the field-widen prism of spatial heterodyne spectrometer is proposed. The optimum apex angle of field-widened prism and the maximum field are analyzed with certain Littrow angles and scene wave-numbers. The results indicate that numerical induction method can find the optimum solution of prism apex angle by judging the effect of all orders of field angle on the phase difference. Compared with the results obtained by theoretical deduce method, the maximum field angle along dispersive principal cross section increases by 10%-30%, and the numerical induction method is simple and obvious, the influencing factors on the maximum field angle can be analyzed in the process of optimizing field-widened prism angle. Source


Fei X.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Fei X.,University of Chinese Academy of Sciences | Feng Y.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | Bai Q.,Xian Institute of Optics Precision Mechanic of Chinese Academy of science | And 5 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2015

A co-path Doppler asymmetric spatial heterodyne spectroscopy (DASH) interferometer with two fields of view to apply to wind vector observations from satellite is presented. The instrument using mirrors as field combiners, Kösters prism as beam splitter, one grating and imaging lens with focal power in one dimension can observe winds at different elevations in two orthogonal look directions. It is compact, without moving parts and efficient. An exact relation of the path offset Dd to Littrow angle and the size of Kösters prism is derived. A system for observation of the O[1D]630 nm emission form satellite is designed to show the process and result of parameters optimizing. Finally, a simulated result for the system indicate that the co-path DASH interferometer with two fields of view has space resolution ability in one dimension, it can get the interferograms at different elevations in two directions without scanning parts and it is possible to obtain the wind vector for the same volume with the help of satellite's moving. ©, 2015, Chinese Optical Society. All right reserved. Source

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