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Optical gas monitor

United States Patent Application

View the Complete Application 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)
11/ 807,538
May 29, 2007
GOVERNMENT INTEREST [0002] 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.