Optical gas monitor

Optics: measuring and testing – By shade or color – With color transmitting filter

Reexamination Certificate

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Reexamination Certificate

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07843565

ABSTRACT:
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.

REFERENCES:
patent: 5191386 (1993-03-01), Grebe
patent: 5637872 (1997-06-01), Tulip
Avetisov, V. G., et al., “Two-Ton Frequency-Modulation Spectroscopy for Quantitative Measurements of Gaseous Species: Theoretical, Numerical, and Experimeental investigation of Line Shapes”,Applied Optics, (Aug. 20, 1996),4705-4723.
Cooper, David E., et al., “Two-Tone Optical Heterodyne Spectroscopy With Diode Lasers: Theory of Line Shapes and Experimental Results”,J. Optical Socienty of America B, vol. 4, No. 4, (Apr. 1987),470-480.
Cuccoli, Fabrizio , et al., “Infrared Tomographic System for Monitoring the Two-Dimensional Distribution of Atmospheric Pollution Over Limited Areas”,IEEE Transactions Geoscience and Remote Sensing, vol. 38, No. 2, (Jan. 2000),155-168.
Gehrtz, Manfred , et al., “Quantum-limited Laser Frequency-Modulation Spectroscopy”,J. Optical Society of America, vol. 2, No. 9, (Sep. 1985),1510-1526.
Modugno, G. , et al., “Fundamental Noise Sources in a High-Sensitivity Two-Ton Frequency Modulation Spectrometer and Detection of CO2 at 1.6um and 2um”,Applied Physics B, (1998),289-296.

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