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Optical gas monitor

United States Patent

November 30, 2010
View the Complete Patent at the US Patent & Trademark Office
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.
Wu; Sheng (San Gabriel, CA), Deev; Andrei (Pasadena, CA), Palm; Steve L. (Escondido, CA), Tang; Yongchun (Walnut, CA), Goddard; William A. (Pasadena, CA)
California Institute of Technology (Pasadena, CA)
11/ 807,538
May 29, 2007
GOVERNMENT INTEREST The U.S. Government has certain rights in this invention pursuant to Grant No. DE-FC26-04NT42212/T-103181 awarded by the Department of Energy.