Optoacoustic gas sensor

Details Optoacoustic gas sensor Optoacoustic gas sensor

2007-05-08

2007-05-08

Williams, Hezron (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C250S344000

Reexamination Certificate

active

11130316

ABSTRACT:
An optoacoustic sensor for detecting one or more target gases includes a body featuring halves containing measurement cells. Each measurement cell is in communication with a light source and a microphone as well as the ambient atmosphere. Evaluation and control electronics are in communication with the light sources and the microphones sequentially illuminate the first and second light sources so that a measurement signal due to optoacoustic pressure variations from a target gas is generated by the microphone of the illuminated or gas active cell and a compensation signal is generated by the microphone of the non-illuminated or gas inactive cell. The compensation signal is subtracted from the measurement signal by the evaluation and control electronics to provide a sensor output signal.

REFERENCES:
patent: 4885469 (1989-12-01), Yamagishi et al.
patent: 5677534 (1997-10-01), Araya
patent: 5933245 (1999-08-01), Wood et al.
patent: 6006585 (1999-12-01), Forster
patent: 2003/0112019 (2003-06-01), Forster et al.

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