光谱学与光谱分析 |
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Study on Phase Correction Method of Spatial Heterodyne Spectrometer |
WANG Xin-qiang1, YE Song1*, ZHANG Li-juan1 , XIONG Wei2 |
1. Department of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China 2. Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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Abstract Phase distortion exists in collected interferogram because of a variety of measure reasons when spatial heterodyne spectrometers are used in practice. So an improved phase correction method is presented. The phase curve of interferogram was obtained through Fourier inverse transform to extract single side transform spectrum, based on which, the phase distortions were attained by fitting phase slope, so were the phase correction functions, and the convolution was processed between transform spectrum and phase correction function to implement spectrum phase correction. The method was applied to phase correction of actually measured monochromatic spectrum and emulational water vapor spectrum. Experimental results show that the low-frequency false signals in monochromatic spectrum fringe would be eliminated effectively to increase the periodicity and the symmetry of interferogram, in addition when the continuous spectrum imposed phase error was corrected, the standard deviation between it and the original spectrum would be reduced form 0.47 to 0.20, and thus the accuracy of spectrum could be improved.
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Received: 2012-10-25
Accepted: 2013-01-08
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Corresponding Authors:
YE Song
E-mail: yesongmail@sina.com
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