Electricity: measuring and testing – Using ionization effects – For analysis of gas – vapor – or particles of matter
Patent
1997-06-17
2000-08-08
Regan, Maura
Electricity: measuring and testing
Using ionization effects
For analysis of gas, vapor, or particles of matter
250286, G01N 2762
Patent
active
06100698&
ABSTRACT:
A chemical sensor comprising a gas detector having first and second printed wiring boards with opposed separated pairs of signal and grounded counter electrodes and processing electronics for processing ionic current signals derived from the signal and counter electrodes. A corona discharge source is provided that produces an ionized air stream containing a chemical that is to be detected. An insulating plate is disposed between the second printed wiring board of the gas detector and the corona discharge source that is used to electrically isolate the electrodes and processing electronics of the gas detector from the corona discharge source. An air flow passage is formed through the corona discharge source, the insulating plate, and the gas detector that allows the ionized air stream generated by the corona discharge source to flow past the signal and counter electrodes, so that the chemical may be detected.
REFERENCES:
patent: 4551624 (1985-11-01), Spangler
patent: 5047723 (1991-09-01), Puumalainen
patent: 5420424 (1995-05-01), Carnahan
patent: 5684300 (1997-11-01), Taylor
Cohn David B.
Megerle Clifford A.
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