Measuring and testing – Gas analysis – By vibration
Reexamination Certificate
2011-06-14
2011-06-14
Fitzgerald, John (Department: 2856)
Measuring and testing
Gas analysis
By vibration
Reexamination Certificate
active
07958771
ABSTRACT:
Various embodiments of the application provide a photoacoustic sensor, which includes: a gas cell having an opening; a light source to generate a radiation to radiate sample gas within the gas cell; a detector to detect the sample gas within the gas cell, and to generate electrical signals in response to acoustic signals generated by pressure fluctuations of the radiated sample gas caused by the radiation; and an active valve having a speaker aligned with the opening of the gas cell. The speaker having a voice coil and a diaphragm attached to the voice coil. A control signal is applicable for the speaker to control access of the gas cell. During sampling, the control signal causes the voice coil of the speaker to repeatedly or constantly lift the diaphragm from contact with the opening of the gas cell to allow sample gas enter the gas cell. While during detecting, the spring force of the voice coil causes the diaphragm in tight contact with the opening of gas cell to seal the gas cell.
REFERENCES:
patent: 3995960 (1976-12-01), Fletcher et al.
patent: 4557603 (1985-12-01), Oehler et al.
patent: 5993245 (1999-11-01), Osada
patent: 6006585 (1999-12-01), Forster
patent: 7034943 (2006-04-01), Moeckli et al.
patent: 7106445 (2006-09-01), Uber
patent: 7398672 (2008-07-01), Riddle
patent: 2004/0145737 (2004-07-01), Hocker
patent: 0356536 (1990-03-01), None
patent: 1522778 (2005-04-01), None
“International Application Serial No. PCT/US2009/002515, International Search Report mailed Jul. 24, 2009”, 5 pgs.
“International Application Serial No. PCT/US2009/002515, Written Opinion mailed Jul. 24, 2009”, 6 pgs.
Fitzgerald John
Honeywell International , Inc.
Schwegman Lundberg & Woessner, P.A.
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