Ye Jianfeng, Tian Ziyang, Hu Yuxin, Wei Haoyun, Li Yan, Zhao Yi, Zou Mingqiang
Appl Opt. 2021 Apr 20;60(12):3540-3548. doi: 10.1364/AO.422321.
Remote Raman instruments have become powerful analytical tools in some special environments. However, ambient daylight is the main limitation in the data acquisition process. To suppress daylight background interference and obtain a high signal-to-background ratio (SBR), we develop a dual-wavelength wide area illumination Raman difference spectroscopy (WAIRDS) system for daytime remote detection. In the WAIRDS system, a wide area illumination scheme and shifted-excitation Raman difference spectroscopy method are used to improve the reliability of collected Raman spectra. Measurements of polystyrene indicate that the WAIRDS system can be operated to obtain background-free Raman spectra under different levels of daylight background interference. The remote results show that the improvement in SBR is about three- to fivefold, and the system can work at distances of up to 9.2 m on a sunny afternoon. Moreover, to be close to the actual detection, the system is used for mineral and explosive raw material detection during daytime measurement. Measurements show that the WAIRDS system will be a useful tool for many remote applications in the future.
远程拉曼仪器已成为某些特殊环境中的强大分析工具。然而，环境日光是数据采集过程中的主要限制因素。为了抑制日光背景干扰并获得高信背比（SBR），我们开发了一种用于白天远程检测的双波长广域照明拉曼差分光谱（WAIRDS）系统。在WAIRDS系统中，采用广域照明方案和移位激发拉曼差分光谱方法来提高所采集拉曼光谱的可靠性。对聚苯乙烯的测量表明，WAIRDS系统能够在不同程度的日光背景干扰下运行以获取无背景拉曼光谱。远程检测结果表明，SBR提高了约三到五倍，并且该系统在阳光充足的下午能够在高达9.2米的距离上工作。此外，为了贴近实际检测，该系统在白天测量期间用于矿物和爆炸物原材料检测。测量结果表明，WAIRDS系统在未来的许多远程应用中将是一种有用的工具。
