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Accurate Wavelength Calibration Method for Flat-Field Grating Spectrometers
Volume 65, Number 9 (Sept. 2011) Page 1083-1086
XUEWEI DU, CHAOYANG LI, ZHE XU, and QIUPING WANG*
A portable spectrometer prototype is built to study wavelength calibration for flat-field grating spectrometers. An accurate calibration method called parameter fitting is presented. Both optical and structural parameters of the spectrometer are included in the wavelength calibration model, which accurately describes the relationship between wavelength and pixel position. Along with higher calibration accuracy, the proposed calibration method can provide information about errors in the installation of the optical components, which will be helpful for spectrometer alignment.
Index Headings: Wavelength calibration; Parameter fitting; Spectrometer alignment; Flat-field spectrometers; Spherical varied line space gratings.