Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-08-15
2006-08-15
Nguyen, Hung (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S630000, C340S632000, C340S577000, C340S578000, C340S581000, C340S583000, C340S584000, C073S024010, C073S024020, C073S587000
Reexamination Certificate
active
07091869
ABSTRACT:
The measuring arrangement contains a measuring cell and a reference cell, respectively, and microphones assigned to these cells, to which microphones an electronic evaluation circuit is connected and in which a subtraction of the signals of the microphones takes place, as well as a radiation source for applying a modulated signal to the measuring cell. The modulation frequency of the radiation source coincides with the resonant frequency of the measuring cell, and the measuring cell and the reference cell are open at at least one end to the gas to and/or aerosol to be detected. The measuring arrangement is used as smoke alarm, gas alarm, fire hazard alarm or as combined smoke and gas alarm, wherein each of the measuring cells is exposed to a radiation of a wavelength at which a relevant substance to be detected is absorbent and an opto-acoustic effect is produced as a result.
REFERENCES:
patent: 4058725 (1977-11-01), Aine
patent: 4594004 (1986-06-01), Ishida et al.
patent: 4740086 (1988-04-01), Oehler et al.
patent: 4817413 (1989-04-01), Asano et al.
patent: 5159411 (1992-10-01), Hammerich et al.
patent: 5331845 (1994-07-01), Bals et al.
patent: 5933245 (1999-08-01), Wood et al.
patent: 6006585 (1999-12-01), Forster
patent: 1807613 (1969-07-01), None
patent: 4132110 (1993-04-01), None
patent: 19637614 (1997-11-01), None
patent: 19826629 (1999-12-01), None
patent: 0849576 (1997-12-01), None
“Nutzung der Inharenten Sensorischen Eigenschaften von Piezoelektrischen Aktoren” by Klaus Kuhnen und Hartmut Janocha;Technisches Messen, vol. 66, 1999, pp. 132-138.
“Differential Helmholtz Resonator as an Optoacoustic Detector”; G. Busse and D. Herboeck;Applied Optics; vol. 18 No. 23, Dec. 1, 1979, pp. 3959-3961.
“Design of Optoacoustic Systems”; C. Forbest Dewey, Jr.; Massachusetts Institute of Technology;Academic Press, New York, 1977, pp. 47-77.
Forster Martin
Nebiker Peter
Baker & Botts LLP
Nguyen Hung
Siemens Building Technologies AG
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