29 April 2016 Standoff detection of gases using infrared laser spectroscopy
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In this work we present a laser-based system for standoff/remote, sensitive detection of gases based on a tunable diode laser source and Wavelength Modulation Spectroscopy method (WMS). System performance was experimentally characterized. The constructed device has proven its capacity of efficient detection of methane in air at the single ppm levels and distances from 10 to 50 m (distance to a scattering object). The minimum detection limit of the system was estimated at the level of 10 ppm-m for the standoff arrangement and the measurement path of approximately 20 m (round trip). Potential application of the device to hydrogen sulfide detection and current limitations in this area are discussed.
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Piotr Jaworski, Piotr Jaworski, Dorota Stachowiak, Dorota Stachowiak, Michał Nikodem, Michał Nikodem, "Standoff detection of gases using infrared laser spectroscopy", Proc. SPIE 9899, Optical Sensing and Detection IV, 98990Q (29 April 2016); doi: 10.1117/12.2227607; https://doi.org/10.1117/12.2227607

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