Closed loop ionization apparatus for detecting trace gases
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United States of America Patent
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Jun 29, 1993
Grant Date -
N/A
app pub date -
Jul 19, 1991
filing date -
Feb 11, 1989
priority date (Note) -
Expired
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Abstract
A trace gas detector including in a closed gas loop, two baffle cells with an intermediate trace gas filter, each baffle cell consists of an ionization source, a labyrinth-like recombination zone and a collector electrode. A differential circuit derives a differential signal from output signals of the two baffle cells, the differential signal depending only on the trace gas concentration. Temperature changes and supply voltage changes are compensated by means of the differential circuit.
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