Closed-loop pulsed helium ionization detector

Details Closed-loop pulsed helium ionization detector Closed-loop pulsed helium ionization detector

1986-02-24

1987-11-10

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250379, H01J 4702

Patent

active

047059486

ABSTRACT:
A helium ionization detector for gas chromatography is operated in a constant current, pulse-modulated mode by configuring the detector, electrometer and a high voltage pulser in a closed-loop control system. The detector current is maintained at a fixed level by varying the frequency of fixed-width, high-voltage bias pulses applied to the detector. An output signal proportional to the pulse frequency is produced which is indicative of the charge collected for a detected species.

REFERENCES:
patent: 3634754 (1972-01-01), Lovelock et al.
patent: 3897344 (1975-07-01), Marshall, III et al.
patent: 4117332 (1978-09-01), Felton et al.
patent: 4538066 (1985-08-01), Carle et al.
Andrawes et al, "Saturation Region of HID . . . ", Anal. Chem. 52 (1980), 891.
Lovelock, J., "EAD and Technique for use . . . ", Anal. Chem. 35 (1963), 474.

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