Measuring and testing – Gas analysis – Odor
Patent
1990-05-16
1992-02-25
Williams, Hezron E.
Measuring and testing
Gas analysis
Odor
73 1G, G01N 3100
Patent
active
050902326
ABSTRACT:
The invention involves the detection of odors using an odor detector including an n-type semiconductor sensor having an electric resistance responsive to odor molecules adsorbed thereonto. An ozonizer is provided within a test compartment to contact the detector with an ozone gas for the purpose of calibrating the detector to an initial zero setting. The test compartment also includes a ventilation fan operable to draw purging air into the compartment. In order to minimize the time required to bring the detector to the initial zero setting, a computer is used to selectively actuate the ozonizer and the ventilation fan in a controlled manner. Before starting a new detection cycle, an operator selects a specific table of optimal pattern for quick recovery to the zero setting from among a plurality of tables stored in the computer, based on certain factors such as the identity and concentration of previously detected odorant substances, etc.
REFERENCES:
patent: 4240799 (1980-12-01), Ryerson
patent: 4563893 (1986-01-01), Tanyolac et al.
patent: 4770027 (1988-10-01), Ehara et al.
patent: 4884435 (1989-12-01), Ehara
Ehara Katuo
Ehara Masahiro
Hara Masataka
Koizumi Takeo
Wakabayashi Yasusuke
Wakabayashi & Co.
Williams Hezron E.
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