Advances in a standoff Raman system for chlorine gas detection

Abstract

Chlorine as a primary material frequently used in industrial processes is relatively easy to obtain and available even in large quantities. It therefore poses a risk in the context of industrial accidents as well as a threat in both terrorist and military scenarios. Early detection, localization and monitoring are essential for the protection of stationary facilities, mobile operations and the public. Hyperspectral detectors using emission or absorption lines in the IR can detect most chemical hazardous materials and warfare agents, but infrared inactive halogens remain invisible with this technique. UV LIDAR systems have shown long-range chlorine detection and tracking capabilities but only with coarse discriminatory value. We present a short-range standoff Raman detector as a complementary unit to close this gap in detection skills. Based on active standoff measurements at distances of 20 to 60 m, detection performance is discussed as well as technical and physical aspects and prospects of system design. Results are compared to a model presented in 2020 (Ref) and discussed with respect to medium detection ranges.