Gas detector

Details Gas detector Gas detector

G - Physics

01

N

G01N 27/66 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2046329

(57) Abstract A trace gas detector comprises in a closed gas loop (1) two baffle cells (2, 5) with an intermediate trace gas filter (4). Each baffle cell consists of an ionization source (21, 51), a labyrinth-like recombination zone and of a collector electrode (22, 52). A differential circuit (7, 9) derives a differential signal from the two output signals of the two baflle cells. This differential signal only depends on the trace gas concentration. Temperature changes and supply voltage changes are compensated by means of the differential circuit.

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