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A Novel Method of Calculation-Separating Second Order Spectrum in Grating Spectrometers

机译：光栅光谱仪中计算分离二阶光谱的新方法

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摘要

In grating spectrometers, according to wavelength, short-wave second-order spectrum superimposes on long-wave spectrum with the wavelength twice as long as the short-wave. Usually spectrum of long-wave range is got via preventing the superimposition of short-wave second-order spectrum by cut-off filters. This paper analyses the characteristic of the ratio of short-wave second-order spectrum in long-wave superimposing spectral range to first-order spectrum in short-wave free spectral range of diffraction gratings. The paper studies a novel method of obtaining long-wave spectrum via calculation-separating short-wave second-order spectrum from mixed spectra in long-wave superimposing spectral range by data processing with the spectrum of free spectral range and the ratio (instrumental parameter) of short-wave second-order spectrum to first-order spectrum measured beforehand. Spectrum-measurement experiments were carried out by VIS-NIR spectrometers (0.36 ～ 1.0 μm). That the spectrum data got via calculation-separation coincide with those got via cut-off filter indicates that spectrum can be obtained by processing the measured date without filters in whole operating wavelength.
机译：在光栅光谱仪中，根据波长，短波二阶光谱叠加在长波光谱上，其波长是短波的两倍。通常，通过利用截止滤波器防止短波二阶频谱的叠加来获得长波范围的频谱。本文分析了长波叠加光谱范围内短波二阶光谱与衍射光栅短波自由光谱范围内一阶光谱之比的特性。本文研究了一种新方法，该方法是通过对自由光谱范围的光谱和比率（仪器参数）进行数据处理，从长波叠加光谱范围内的混合光谱中分离出短波二阶光谱，从而获得长波光谱。短波二阶频谱与预先测量的一阶频谱的关系。用VIS-NIR光谱仪（0.36〜1.0μm）进行光谱测量实验。通过计算分离获得的光谱数据与通过截止滤光片获得的光谱数据一致，表明可以通过在整个工作波长中不使用滤光片的情况下处理测量数据来获得光谱。

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