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Jiaxiang Liu

at Hefei Institutes of Physical Science CAS

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Proceedings Article | 24 November 2021 Paper

A new eye-safe compact UV-Raman spectroscopy setup for the proximal detection of hazardous chemicals

Ganshang Si, Yonghua Fang, Jiaxiang Liu, Wenbiao Huang, Zhengang Li, Xin Yu, Beibei Si, Zhen Cheng

Proceedings Volume 12064, 120640G (2021) https://doi.org/10.1117/12.2606493

KEYWORDS: Raman spectroscopy, Spectroscopy, Ultraviolet radiation, Signal detection, Safety, Eye, Pulsed laser operation, Potassium, Bioalcohols, Spectroscopes

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Hazardous chemicals leakage and explosions issues severely threaten public safety and social development. In recent years, Raman spectroscopy has the advantages of multi-component detection, with a simple device and nondestructive detection, and it has been applied in the detection of hazardous chemicals. There are many advantages of excitation UV compared to visible or near-IR counterparts: 1) Solar blind detection enabling standoff operation in full daylight; 2) Fluorescence-free Raman enabling enhanced detection and identification of target materials without interference; 3) Eye retina safe. Based on the above analysis, a compact proximal UV-Raman spectroscopy setup was built in the laboratory. A 266nm UV laser with a high repetition rate was used as the light source in the setup, which has many advantages, such as a cramped structure with an air-cooled device and low energy. An independently built Galileo transmission telescope was be used to collect signals in the setup. In addition, a customized UV high-sensitivity fiber spectrometer was used to detect the Raman signals. Typical hazardous chemicals (dichloromethane, anhydrous ethanol, potassium nitrate) were detected at 1000mm using the built setup. The experimental results indicated that clear Raman signals of the hazardous chemicals could be detected when the exposure time of the spectrometer was only 15ms (satisfied the conditions of human eyes safety). A new eye-safe UVRaman spectroscopy technology in this paper provides method support for rapidly detecting hazardous chemicals in the future.

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