为了实现远距离物质的识别检测, 设计和建立了脉冲门控非接触式的拉曼光谱探测系统, 利用强脉冲激光的高能量密度(～106 W)增强被探测物质的拉曼散射信号, 通过大口径透镜系统提高拉曼光收集效率, 同时采用同步延时系统控制ICCD的开启和积分时间, 有效地去除背景光和荧光的干扰, 提高信噪比, 从而显著增加拉曼光谱探测距离。初步研究了不同通光口径对探测能力的影响, 以及在950 mm的探测距离上获得了清晰的硫元素和纯净水的拉曼光谱信号。

In order to realize the recognition and detection of remote material, a non-contact pulse gated Raman detection system was designed and established, by using the high energy density of strong pulsed laser(~106 W) enhanced the Raman scattering signal from the substances detected, a large aperture lens system was used to improve Raman light collection efficiency, while using synchronous delay system to control the open and integral time of ICCD, the background interference light and fluorescence were removed to improve the signal-to-noise ratio, thus increasing the Raman spectrum detection distance. The influence of different lens aperture was studied, the clear Raman spectra of sulfur elements and water were also obtained at a detection distance of 950 mm.