Factors determining the stability, resolution, and precision of a conventional Raman spectrometer
Factors determining the stability, resolution, and precision of a conventional Raman spectrometer
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DOI：
10.1366/000370206778062165
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发表时间：
2006-08-01
影响因子：
3.5
通讯作者：
Kagi, Hiroyuki
中科院分区：
文献类型：
--
作者：
Fukura, Satoshi;Mizukami, Tomoyuki;Kagi, Hiroyuki
我们验证了传统拉曼光谱仪的性能，该光谱仪由30厘米单多色仪、硅基电荷耦合器件（CCD）相机和全息超陷波滤波器组成。为此，连续监测了萘的拉曼光谱和红宝石（掺Cr的Al_2 O_3）的荧光光谱的峰位随时间的变化。观察到由两个分量组成的随时间变化的偏差：高达0.4 cm（-1）的单调漂移和范围为0.15 cm（-1）的周期性振荡。前一个分量在CCD探测器冷却后约2000 s稳定，表明CCD探测器的不完全制冷引起了漂移。后一个分量与室温的周期性振荡同步，表明整个装置的热膨胀或收缩引起这种振荡。当在恒定的室温下使用充分冷却的CCD探测器进行测量时，实现偏差减小。此外，在比该振荡的一个周期长的持续时间上获取的光谱中，室温振荡的影响降低。用最小二乘拟合法对精密测量的光谱进行拟合，使用像素分辨率为1.5cm（-1）的光谱仪测定峰位的精度提高到0.05cm（-1）。
We verified the performance of a conventional Raman spectrometer, which is composed of a 30 cm single polychromator, a Si based charge-coupled device (CCD) camera, and a holographic supernotch filter. For that purpose, the time change of the peak positions of Raman spectra of naphthalene and fluorescence spectra of ruby (Cr-doped Al2O3) were monitored continually. A time-dependent deviation composed of two components was observed: a monotonous drift up to 0.4 cm(-1) and a periodic oscillation with a range of 0.15 cm(-1). The former component was stabilized at approximately 2000 s after the CCD detector was cooled, indicating that incomplete refrigeration of the CCD detector induced the drift. The latter component synchronized with the periodic oscillation of the room temperature, indicating that thermal expansion or contraction of the whole apparatus induced this oscillation. The implemental deviation is reduced when measurements are conducted using a sufficiently cooled CCD detector at a constant room temperature. Moreover, the effect of the room temperature oscillation is lowered in a spectrum acquired over a duration that is longer than one cycle of this oscillation. Applying the least squares fitting method to carefully measured spectra enhanced the precision of the determination of the peak position to 0.05 cm(-1) using the spectrometer with pixel resolution of 1.5 cm(-1).