Method and apparatus for detecting odors

Measuring and testing – Gas analysis – Odor

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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

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