Photo-ionization detector for volatile gas measurement

Details Photo-ionization detector for volatile gas measurement Photo-ionization detector for volatile gas measurement

1996-03-22

1998-06-30

Glick, Edward J.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250379, G01N 2766

Patent

active

057738335

ABSTRACT:
A photo-ionization detector (PID) which measures volatile organic gas uses electrically insulated parallel plates to energize a miniaturized gas discharge UV lamp and an energy efficient method to modulate the UV lamp intensity and reduce power consumption. A miniaturized centrifugal pump is integrated into the PID to provide active sampling for fast response to volatile gas. An ionization chamber in the PID includes a UV shield which protects a measurement electrode from UV light and a UV monitor which measures changes in UV intensity due to external interferences and UV lamp variations. A microprocessor in the PID uses measurements from the measurement electrode and from the UV monitor to accurately account for UV intensity variations when determining a volatile gas concentration.

REFERENCES:
patent: 2959677 (1960-11-01), Robinson et al.
patent: 4778998 (1988-10-01), Carnahan
patent: 5393979 (1995-02-01), Hsi
patent: 5572137 (1996-11-01), Jones

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