光谱学与光谱分析 |
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High-Precision Wavelength Calibration of Wide-Band Monochromator |
ZHANG Zi-hui1,2, WANG Shu-rong1*, HUANG Yu1, LI Bo1, YU Xiang-yang1,2, LIN Guan-yu1 |
1. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Usually the monochromator is used to output monochromatic light to calibrate the space remote sensing spectrometer. In the present paper, the confidence of space remote sensing spectrometer is used as a standard to evaluate the precision of wide-band monochromator wavelength calibration. Through analysis of the accuracy of the instrument, the monochromator wavelength repeatability error and deviations was obtained respectively. And the intrinsic spectrum of the high pressure mercury lamp and the grating diffraction was used as calibration lines to avoid the error caused by replacing the light source. Through the special method of wavelength calibration to shorten the scan time, the Gaussian fitting was used to look for peaks of wavelength to reduce error. Finally, the relationship derived from polynomial fitting to measure the exact wavelengths’ accuracy of the monochromator and calculate the calibration confidence of the space remote sensing spectrometer. Using this method, we can make wavelength accuracy of the 1.5 M monochromator with wavelength band from 200 to 840 nm to reach to ±0.016 nm, then the confidence of the space remote sensing spectrometer can reach to 99.82%.
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Received: 2012-04-26
Accepted: 2012-07-15
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Corresponding Authors:
WANG Shu-rong
E-mail: srwang@ciomp.ac.cn
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