Glow discharge detector

Patent · 01 January 2002

OSTI ID:874769

Koo, Jackson C ^[1]; Yu, Conrad M ^[2]

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1. San Ramon, CA
2. Antioch, CA

A highly sensitive electronic ion cell for the measurement of trace elements in He carrier gas which involves glow discharge. A constant wave (CW) glow discharge detector which is controlled through a biased resistor, can detect the change of electron density caused by impurities in the He carrier gas by many orders of magnitude larger than that caused by direct ionization or electron capture. The glow discharge detector utilizes a floating pseudo-electrode to form a probe in or near the plasma. By using this probe, the large variation of electron density due to trace amounts of impurities can be directly measured.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: The Regents of the University of California (Oakland, CA)
• Patent Number(s): US 6457347
• OSTI ID: 874769
• Country of Publication: United States
• Language: English

Related Subjects

/73/
amounts
biased
capture
carrier
carrier gas
caused
cell
change
constant
controlled
cw
density
detect
detector
direct
directly
discharge
due
electron
electron capture
electronic
elements
floating
form
gas
glow
glow discharge
highly
impurities
involves
ionization
larger
magnitude
measured
measurement
near
plasma
probe
pseudo-electrode
resistor
sensitive
trace
utilizes
variation
wave