Pulsed helium ionization detection system

Details Pulsed helium ionization detection system Pulsed helium ionization detection system

1985-04-09

1987-11-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250384, 250381, G01N 2766

Patent

active

047059478

ABSTRACT:
A helium ionization detection system is provided which produces stable operation of a conventional helium ionization detector while providing improved sensitivity and linearity. Stability is improved by applying pulsed dc supply voltage across the ionization detector, thereby modifying the sampling of the detectors output current. A unique pulse generator is used to supply pulsed dc to the detector which has variable width and interval adjust features that allows up to 500 V to be applied in pulse widths ranging from about 150 nsec to about dc conditions.

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patent: 4137453 (1979-01-01), Siegel
patent: 4538066 (1985-08-01), Carle et al.
patent: 4567368 (1986-01-01), Well et al.
Andrawes et al., Anal. Chem., 52 (1980) 891, "Saturation Region of HID for Gas-Solid . . . Chromat".
Lovelock, J., Anal. Chem., 35 (1963), 474, "Electron Absorp. Det. and Techn. . . . for Chromat".

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