Optical gas monitor

Wu, Sheng; Deev, Andrei; Palm, Steve L; Tang, Yongchun; Goddard, William A

Title: Optical gas monitor

Patent · Tue Nov 30 00:00:00 EST 2010

OSTI ID:1014721

Wu, Sheng ^[1]; Deev, Andrei ^[2]; Palm, Steve L ^[3]; Tang, Yongchun ^[4]; Goddard, William A ^[2]

San Gabriel, CA
Pasadena, CA
Escondido, CA
Walnut, CA

A frequency modulated spectroscopy system, including a photo-detector, a band-pass filter to filter the output of the photo-detector, and a rectifier to demodulate. The band-pass filter has a relatively high Q factor. With the high Q factor band-pass filter and rectifier, a reference sinusoid is not required for demodulation, resulting in phase-insensitive spectroscopy. Other embodiments are described and claimed.

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Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: FC26-04NT42212

Assignee:: California Institute of Technology (Pasadena, CA)

Patent Number(s):: 7,843,565

Application Number:: US Patent Application 11/807,538

OSTI ID:: 1014721

Country of Publication:: United States

Language:: English

References (5)

Quantum-limited laser frequency-modulation spectroscopy Gehrtz, Manfred; Whittaker, Edward A.; Bjorklund, Gary C. Journal of the Optical Society of America B, Vol. 2, Issue 9 https://doi.org/10.1364/JOSAB.2.001510	journal	January 1985
Two-tone optical heterodyne spectroscopy with diode lasers: theory of line shapes and experimental results Cooper, David E.; Warren, Russell E. Journal of the Optical Society of America B, Vol. 4, Issue 4 https://doi.org/10.1364/JOSAB.4.000470	journal	January 1987
Infrared tomographic system for monitoring the two-dimensional distribution of atmospheric pollution over limited areas Cuccoli, F.; Facheris, L.; Tanelli, S. IEEE Transactions on Geoscience and Remote Sensing, Vol. 38, Issue 1 https://doi.org/10.1109/36.823909	journal	January 2000
Two-tone frequency-modulation spectroscopy for quantitative measurements of gaseous species: theoretical, numerical, and experimental investigation of line shapes Avetisov, V. G.; Kauranen, P. Applied Optics, Vol. 35, Issue 24 https://doi.org/10.1364/AO.35.004705	journal	January 1996
Fundamental noise sources in a high-sensitivity two-tone frequency modulation spectrometer and detection of CO 2 at 1.6 μm and 2 μm Modugno, G.; Corsi, C.; Gabrysch, M. Applied Physics B: Lasers and Optics, Vol. 67, Issue 3 https://doi.org/10.1007/s003400050508	journal	September 1998

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