Measuring and testing – Gas analysis – Ambient air
Patent
1994-08-03
1996-09-03
Williams, Hezron E.
Measuring and testing
Gas analysis
Ambient air
73 2901, 73 75, 7320411, 73 2504, 340634, G08B 1710, G01F 168, G01N 2518
Patent
active
055512836
ABSTRACT:
A low-cost and quick-response type gas-density sensing element is free from positioning error of sensing ambient temperature and gas density and can accurately sense the gas flow even if the environmental conditions sharply change. An output voltage V.sub.1 proportional to an ambient temperature is obtained by heating a sensing element at low temperature and an output voltage V.sub.2 proportional to the ambient temperature and humidity is obtained by heating the sensing element at a high temperature. An output voltage which is proportional to the humidity is obtained by subtracting the voltage value V.sub.1 from the voltage value V.sub.2.
REFERENCES:
patent: 2949765 (1960-08-01), Thayer et al.
patent: 3549327 (1970-12-01), Fergusson
patent: 3864959 (1975-02-01), MacDonald
patent: 3886797 (1975-06-01), Bauer
patent: 3905230 (1975-09-01), Calvet et al.
patent: 3913379 (1975-10-01), Rusz et al.
patent: 4043196 (1977-08-01), Trageser
patent: 4123934 (1978-11-01), Hoht
patent: 4164862 (1979-08-01), Jackson
patent: 4532797 (1985-08-01), Yang
patent: 4594879 (1986-06-01), Maeda et al.
patent: 4682503 (1987-07-01), Higashi et al.
patent: 4896143 (1990-01-01), Dolnick et al.
patent: 4902138 (1990-02-01), Goeldner et al.
patent: 5117691 (1992-06-01), Fraser
patent: 5379630 (1995-01-01), Lacey
Patent Abstracts of Japan, vol. 17, No. 553 (P-1625) 5 Oct. 1993 & JP-A-05 157 759 (Zexel).
Patent Abstracts of Japan, vol. 12, No. 331 (P-755) 7 Sep. 1988 & JP-A-63 094 144 (Yokogawa Hewlett Packard).
Database WPI, Week 8135, Derwent Publications Ltd., London, GB; AN 81-J1003D 35 & SU-A-777 585 (UFA Aviation) 8 Nov. 1980.
Ishibashi Tetsuo
Manaka Junji
Ricoh Seiki Company, Ltd.
Wiggins J. David
Williams Hezron E.
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