Closed-loop pulsed helium ionization detector

Patent · Wed Dec 31 23:00:00 EST 1986

OSTI ID:866420

Ramsey, Roswitha S ^[1]; Todd, Richard A ^[1]

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1. Knoxville, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4705948
• OSTI ID: 866420
• Country of Publication: United States
• Language: English

Related Subjects

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applied
bias
charge
charge collected
chromatography
closed-loop
closed-loop control
collected
configuring
constant
constant current
control
current
detected
detector
electrometer
fixed
fixed level
fixed-width
frequency
gas
gas chromatograph
gas chromatography
helium
helium ionization
high-voltage
indicative
ionization
ionization detector
level
loop control
maintained
mode
operated
output
output signal
produced
proportional
pulse
pulse frequency
pulse-modulated
pulsed
pulsed helium
pulser
pulses
pulses applied
signal
signal proportional
species
varying
voltage
voltage bias
voltage pulse
voltage pulser