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Title: Closed-loop pulsed helium ionization detector

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.

Inventors:
 [1];  [1]
  1. Knoxville, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
866420
Patent Number(s):
4705948
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
closed-loop; pulsed; helium; ionization; detector; gas; chromatography; operated; constant; current; pulse-modulated; mode; configuring; electrometer; voltage; pulser; control; maintained; fixed; level; varying; frequency; fixed-width; high-voltage; bias; pulses; applied; output; signal; proportional; pulse; produced; indicative; charge; collected; detected; species; voltage bias; charge collected; constant current; signal proportional; voltage pulse; gas chromatography; output signal; ionization detector; gas chromatograph; pulse frequency; pulses applied; helium ionization; fixed level; closed-loop control; pulsed helium; loop control; voltage pulser; /250/

Citation Formats

Ramsey, Roswitha S, and Todd, Richard A. Closed-loop pulsed helium ionization detector. United States: N. p., 1987. Web.
Ramsey, Roswitha S, & Todd, Richard A. Closed-loop pulsed helium ionization detector. United States.
Ramsey, Roswitha S, and Todd, Richard A. Thu . "Closed-loop pulsed helium ionization detector". United States. https://www.osti.gov/servlets/purl/866420.
@article{osti_866420,
title = {Closed-loop pulsed helium ionization detector},
author = {Ramsey, Roswitha S and Todd, Richard A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

Patent:

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