Odor concentration measurement method and apparatus for use in f

Details Odor concentration measurement method and apparatus for use in f Odor concentration measurement method and apparatus for use in f

1995-03-14

1997-04-22

O'Shea, Sandra L.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

422 83, G01R 2708, G01N 2704

Patent

active

056232128

ABSTRACT:
An odor concentration is measured by energizing an odor sensor connected across a power supply through a load resistance. A total resistance of the odor sensor is represented by and includes a parallel connection of a first resistive component having a value according to surrounding environmental conditions and a second resistive component having a value according to an odor concentration, and a saturation resistive component connected in series with the parallel connection of the first and second resistive components. A CPU is used to measure the odor concentration by obtaining the value of the second resistive component from an output of the odor sensor which is a voltage across the load resistance. Also, the measured odor concentration can be normalized and compared with a given threshold for fire detection.

REFERENCES:
patent: 4770027 (1988-09-01), Ehara et al.
patent: 5177994 (1993-01-01), Moruzumi et al.

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