Closed-loop pulsed helium ionization detector

Patent · Thu Jan 01 00:00:00 EST 1987

OSTI ID:866420

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

---

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 (United States)
• 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

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/