A demonstration of spatial heterodyne spectrometers for remote LIBS, Raman spectroscopy, and 1D imaging
A demonstration of spatial heterodyne spectrometers for remote LIBS, Raman spectroscopy, and 1D imaging
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DOI：
10.1016/j.sab.2021.106108
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
K. Fessler;A. Waldron;A. Colón;J. Carter;S. Angel
中科院分区：
文献类型：
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作者：
K. Fessler;A. Waldron;A. Colón;J. Carter;S. Angel
三个空间外差拉曼光谱仪，一个独立的，其他单片，已被用于远程拉曼和LIBS的样品在4.5米的距离和一维拉曼成像。SHS的大面积测量能力被证明，并显示在拉曼的情况下，使用样品上的大激光光斑，减少样品的光降解，而不会损失信号或降低光谱分辨率。使用独立式SHRS和单片SHRS的1D拉曼成像被证明并且示出为异质样品提供比没有成像测量的光谱更好的信噪比（SNR）光谱。使用1D成像的改善的SNR是来自样品的不同区域的信号的空间分离的结果，这减少了散射较强的样品区域对散射较弱的相邻样品区域的散粒噪声的贡献。对于相邻样品的1D成像，在光谱仪的视场（FOV）内，SNR提高了四倍，而没有光谱分辨率或光谱范围的损失，并且对于位于光谱仪4.5 m处的样品，空间分辨率为280 μm。
Three spatial heterodyne Raman spectrometers, one free standing, the others monolithic, have been used for remote Raman and LIBS for samples at a distance of 4.5 m and 1D Raman imaging. The wide area measurement capability of the SHS was demonstrated and shown to reduce sample photodegradation in the case of Raman, using large laser spots on the sample, without loss of signal or decreased spectral resolution. 1D Raman imaging using a free standing SHRS and a monolithic SHRS was demonstrated and shown to provide better signal-to-noise ratio (SNR) spectra for heterogenous samples than spectra measured without imaging. Improved SNR using 1D imaging is the result of spatial separation of the signal from different areas of the sample, which reduces the contribution of shot noise from stronger scattering sample regions to more weakly scattering adjacent sample regions. For 1D imaging of adjacent samples, within the field-of-view (FOV) of the spectrometer, the SNR improved up to four times, with no loss of spectral resolution or spectral range, and a spatial resolution of 280 μm was demonstrated for samples located at 4.5 m from the spectrometer.