光谱学与光谱分析, 2011, 31 (9): 2428, 网络出版: 2011-11-09   

水下拉曼光谱探测低通滤光片水拉曼信号抑制

Water Raman Spectrum Suppression with Low-Pass Filter in Underwater In-Situ Raman Spectroscopy
作者单位
1 中国海洋大学海底科学与探测技术教育部重点实验室, 山东 青岛266100
2 中国海洋大学海洋遥感研究所, 山东 青岛266003
摘要
拉曼光谱作为研究物质结构的一个强有力工具, 被广泛应用于水环境物质的检测, 近年在深海原位探测中也得到应用。 文章针对水下拉曼光谱探测的需要, 设计了用于水的O—H振动拉曼信号抑制的低通滤光片, 经过计算, 边缘为指数形式的低通滤光片可较好的满足需要, 而且通过实际采用的低通滤光片的实验证明, 采用低通滤光片后水的O—H振动拉曼信号得到较好的抑制, 同时对于<3 000 cm-1的范围内其他物质拉曼光谱的探测几乎没有影响, 达到了设计目的。
Abstract
As a powerful tool for studying chemical structures, Raman spectroscopy has been used in aquatic environments in-situ measurement widely, and has been used in deep sea research recently. For underwater in-situ detection, O—H vibration Raman peak of water is inherent and strong compared with other dissolved matter’s Raman signals. When the authors want to get a good SNR Raman signal of dissolved matter by increasing detection time, O—H vibration Raman peak of water will get to saturation easily, which influences other Raman signal’s detection. In the present paper, a specially designed short-pass optical filter was used for suppression of water’s O—H vibration Raman peak. The authors calculated the suppression effect of short-pass optical filter with linear and exponential edges. The simulation shows that exponential edge filter has better performance and can suppress water’s O—H vibration Raman peak effectively. The experiment also proves the calculation results. With the suppression optical filter, the intensity of water’s O—H vibration Raman signal and other dissolved matters’ become similar. And the influence of suppression optical filter on other dissolved matters’ Raman signal is little. So the suppression optical filter is feasible for in-situ underwater Raman spectroscopy.

郭金家, 刘智深. 水下拉曼光谱探测低通滤光片水拉曼信号抑制[J]. 光谱学与光谱分析, 2011, 31(9): 2428. GUO Jin-jia, LIU Zhi-shen. Water Raman Spectrum Suppression with Low-Pass Filter in Underwater In-Situ Raman Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2011, 31(9): 2428.

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