Random Noise Reduction with More Accurate Calibration for a Spectrometer Using a Two-Dimensional Array Detector

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An efficient noise-reduction method with a more accurate wavelength calibration procedure is proposed for a spectrometer system to achieve a higher signal-to-noise ratio and spectral resolution. By using a two-dimensional (2D) array detector with an integrated grating composed of 10 sub-gratings, the system has a merit of high data acquisition speed to satisfy the condition in which in-situ spectral data analysis is critically required. The noise level has been effectively reduced down to approximately 25% of the previous level. The spectral curvature effect due to imperfection of the optical system is also analyzed and significantly reduced using the spectral calibration procedure to achieve higher resolution.