Solid-state multi-stage gas detector

Details Solid-state multi-stage gas detector Solid-state multi-stage gas detector

1993-09-01

1994-12-13

Snay, Jeffrey R.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 88, 422 98, 73 3102, 338 34, G01N 2704

Patent

active

053727851

ABSTRACT:
A solid-state, multi-stage gas detector for detecting a selected gaseous species from a plurality of gaseous species. The multi-stage gas detector includes a first conductive layer, exposable to the plurality of gaseous species, which permits the selected gaseous species to diffuse therethrough and which interacts with at least one of the plurality of gaseous species such that its conductivity changes. A second conductive layer, electrically isolated from the first conductive layer, interacts with the selected gaseous species after it has passed through the first conductive layer such that the second conductive layer's conductivity changes in relation thereto. Electrodes are attached to the first conductive layer and to the second conductive layer for separate detection of conductivity changes within the conductive layers. Detector conductivity changes comprise detection information correlated to the selected gaseous species. Multiple gaseous species may be concurrently detected by the multi-stage detector through appropriate selection of conductive layers for a given environment.

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