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13 May 2020 Portable broadband photoacoustic spectroscopy for trace gas and aerosols detection by quantum cascade laser arrays
Chien-Sheng Liao, Romain Blanchard, Christian Pfluegl, Masud Azimi, Fred Huettig, Daryoosh Vakhshoori
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Proceedings Volume 11416, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXI; 1141609 (2020) https://doi.org/10.1117/12.2558803
Event: SPIE Defense + Commercial Sensing, 2020, Online Only
Abstract
We present a portable broadband photoacoustic spectroscopic system for trace gas or aerosol detection using distributed feedback quantum cascade laser arrays. By sequentially firing 128 lasers, our system acquires a photoacoustic spectrum covering 565 cm-1 (935-1500 cm-1) with a normalized-noise-equivalent-absorption coefficient of 2.5×10-9 cm−1WHz−1/2. In addition to sequential firing mode, the laser source can be operated in multiplexing mode. The firing sequence that determines when and which laser to be activated is programmable, which enables frequency-multiplexing excitation. For demonstration, we modulate 12 lasers at 12 distinct frequencies and a photoacoustic spectrum is acquired within 13 ms.
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Chien-Sheng Liao, Romain Blanchard, Christian Pfluegl, Masud Azimi, Fred Huettig, and Daryoosh Vakhshoori "Portable broadband photoacoustic spectroscopy for trace gas and aerosols detection by quantum cascade laser arrays", Proc. SPIE 11416, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXI, 1141609 (13 May 2020); https://doi.org/10.1117/12.2558803
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KEYWORDS
Quantum cascade lasers
Photoacoustic spectroscopy
Aerosols
FT-IR spectroscopy
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