Photo-ionization detector for detecting volatile organic gases

Details Photo-ionization detector for detecting volatile organic gases Photo-ionization detector for detecting volatile organic gases

Filed on

1993-05-12

Date issued

1995-02-28

Examiner

Fields, Carolyn E.

Patent Class

Radiant energy

SubClass

Invisible radiant energy responsive electric signalling

SubSubClass

Including a radiant energy responsive gas discharge device

Other Related Categories

250379, 250423P, 324464, G01N 2766

Type

Patent

Status

active

Patent number

053939794

Description

ABSTRACT:
A photo-ionization detector utilizes an ultraviolet (UV) lamp for detecting and measuring the concentration of volatile gases flowing between closely spaced parallel electrodes. One of the electrodes is made of mesh to allow photons to pass into the space between the electrodes to ionize the volatile gases between the electrodes. The detector also incorporates an improved ionization chamber. In other embodiments, a plurality of gas discharge lamps, each generating a different photon energy, may be placed adjacent to a plurality of closely spaced electrodes, all electrodes in one ionization chamber, to detect and measure different types of volatile gases that may exist.

REFERENCES:
patent: 2959677 (1960-11-01), Robinson et al.
patent: 5254861 (1993-10-01), Carpenter et al.

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