We describe the fabrication of an underwater time-gated standoff Raman sensor, consisting of a custom Raman spectrometer, custom scanner, and commercial diode-pumped pulsed 532-nm laser all located inside pressure housing. The Raman sensor was tested in the laboratory with samples in air, a tank containing tap water and seawater, and in the coastal Hawaiian harbor. We demonstrate our new system by presenting standoff Raman spectra of some of the chemicals used in homemade explosive (HME) devices and improvised explosive devices (IED), including sulfur, nitrates, chlorates, and perchlorates up to a distance of ~6 m in seawater and tap water. Finally, the Raman spectra of these hazardous chemicals sealed inside plastic containers submersed in the Hawaiian Harbor water are also presented

我们描述了水下定时门控拉曼传感器的制造过程，该传感器由一个自定义拉曼光谱仪，自定义扫描仪和商用二极管泵浦脉冲532 nm激光器组成，所有激光器均位于压力壳体内。拉曼传感器在实验室中，空气中，装有自来水和海水的水箱中以及沿海夏威夷港口进行了测试。我们通过展示自制炸药（HME）设备和简易炸药设备（IED）中使用的某些化学物质（包括硫，硝酸盐，氯酸盐和高氯酸盐，海水中最远约6 m的距离）的静态拉曼光谱来演示我们的新系统。和自来水。最后，还介绍了密封在淹没在夏威夷海港水中的塑料容器中的这些有害化学物质的拉曼光谱。