Measuring atmospheric methane and water vapour using near-infrared diode lasers

D. Christian Hovde; Joel A. Silver; Alan C. Stanton

doi:10.1117/12.177290

3 June 1994 Measuring atmospheric methane and water vapour using near-infrared diode lasers

D. Christian Hovde, Joel A. Silver, Alan C. Stanton

Proceedings Volume 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements; (1994) https://doi.org/10.1117/12.177290
Event: SPIE's International Symposium on Optical Sensing for Environmental Monitoring, 1993, Atlanta, GA, United States

Abstract

Single-frequency near-infrared diode lasers are used to measure atmospheric methane and water vapor. Using high-frequency wavelength modulation methods, sensitive instrumentation with fast time response are designed. Communications lasers operating near 1310 nm probe weak overtone transitions of both molecules; lasers with custom wavelengths at present lack sophisticated packaging, but can achieve much higher sensitivity. We describe two field-tested instruments: an automated, airborne hygrometer with a sensitivity of 8 ppm (by volume) with a one second averaging time, and a fast response methane sensor with a sensitivity of 65 ppb. Improvements to these instruments are outlined, and the effects of laser nonlinearities are noted.

Citation Download Citation

D. Christian Hovde, Joel A. Silver, and Alan C. Stanton "Measuring atmospheric methane and water vapour using near-infrared diode lasers", Proc. SPIE 2112, Tunable Diode Laser Spectroscopy, Lidar, and DIAL Techniques for Environmental and Industrial Measurements, (3 June 1994); https://doi.org/10.1117/12.177290

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