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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 detect and detect long-distance matter, a pulse-gated non-contact Raman spectroscopy detection system is designed and developed. Raman scattering signal of the detected material is enhanced by the high energy density (~ 106 W) of the intense pulsed laser. Large-aperture lens system enhances the Raman light collecting efficiency, simultaneously uses the synchronous delay system to control the opening and integration time of ICCD, effectively removes the interference of background light and fluorescence, improves the signal-to-noise ratio, and significantly increases the detection range of Raman spectrum. The effects of different aperture on the detection ability were studied preliminarily, and the clear Raman spectra of sulfur and pure water were obtained at the detection range of 950 mm.