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New Lidar challenges for gas hazard management in industrial environments

机译：激光雷达对工业环境中气体危害管理的新挑战

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The capability of Lidars to perform range-resolved gas profiles makes them an appealing choice for many applications. In order to address new remote sensing challenges, arising from industrial contexts, Onera currently develops two lidar systems, one Raman and one DIAL. On the Raman side, a high spatial-resolution multi-channel Raman Lidar is developed in partnership with the French National Radioactive Waste Management Agency (Andra). This development aims at enabling future monitoring of hydrogen gas and water vapor profiles inside disposal cells containing radioactive wastes. We report on the development and first tests of a three-channel Raman Lidar (H_2, H_2O, N_2) designed to address this issue. Simultaneous hydrogen and water vapor profiles have been successfully performed along a 5m-long gas cell with lm resolution at a distance of 85 m. On the DIAL side, a new instrumental concept is being explored and developed in partnership with Total E&P. The objective is to perform methane plume monitoring and flux assessment in the vicinity of industrials plants or platforms. For flux assessment, both gas concentration and air speed must be profiled by lidar. Therefore, we started developing a bi-function, all-fiber, coherent DIAL/Doppler Lidar. The first challenge was to design and build an appropriate fiber laser source. The achieved demonstrator delivers 200 W peak power, polarized, spectrally narrow (<15 MHz), 110 ns pulses of light out of a monomode fiber at 1645 nm. It fulfills the requirements for a future implementation in a bi-function Dial/Doppler lidar with km-range expectation. We report on the laser and lidar architecture, and on first lidar tests at 1645 nm.
机译：激光雷达具有执行范围分辨的气体剖面的能力，使其成为许多应用的理想选择。为了应对由工业环境引起的新的遥感挑战，Onera当前开发了两种激光雷达系统，一种拉曼系统和一种DIAL系统。在拉曼方面，与法国国家放射性废物管理局（Andra）合作开发了具有高空间分辨率的多通道拉曼激光雷达。这项进展旨在使将来能够监控含有放射性废物的处置池中的氢气和水蒸气分布。我们报告了旨在解决此问题的三通道拉曼激光雷达（H_2，H_2O，N_2）的开发和首次测试。沿着5m长的气室以lm分辨率在85 m的距离上成功完成了氢和水蒸气的同时测量。在DIAL方面，正在与Total E＆P合作探索和开发一种新的乐器概念。目的是在工厂或平台附近进行甲烷羽流监测和通量评估。为了进行通量评估，必须通过激光雷达对气体浓度和空气速度进行分析。因此，我们开始开发一种双功能，全光纤，连贯的DIAL /多普勒激光雷达。第一个挑战是设计和制造合适的光纤激光源。所获得的演示器从1645 nm的单模光纤发出200 W峰值功率，偏振的，光谱窄的（<15 MHz），110 ns的光脉冲。它可以满足具有公里范围期望的双功能拨盘/多普勒激光雷达中未来实现的要求。我们报告了激光和激光雷达架构，以及在1645 nm的首次激光雷达测试。

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