Colorimetric detection apparatus

Details Colorimetric detection apparatus Colorimetric detection apparatus

1990-05-11

1992-02-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356402, 250211J, 250239, 422 87, G01J 350, G01J 148

Patent

active

050916424

ABSTRACT:
A monitor for the detection of a target gas by sensing the color change of a colorimetric indicator material. The monitor includes a light detector positioned and having a surface oriented to receive light reflected from the colorimetric indicator material and a light source positioned between the colorimetric indicator material and the light detector and oriented to provide illumination to the colorimetric indicator material but not to the light detector.

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patent: 4115067 (1978-09-01), Lyshkow
patent: 4181699 (1980-01-01), Kitzinger
patent: 4245997 (1981-01-01), Wiesner
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patent: 4472353 (1984-09-01), Moore
patent: 4617277 (1986-10-01), Bohl
patent: 4681454 (1987-07-01), Breemer
patent: 4806491 (1989-02-01), Heim
patent: 4906839 (1990-03-01), Lee
patent: 4913881 (1990-04-01), Evers
patent: 4972089 (1990-11-01), Stevenson

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