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:
-
- Knoxville, TN
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (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}
}
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