Self-modulating pressure gauge

Patent · Tue Aug 07 00:00:00 EDT 1979

OSTI ID:6763681

Edwards, D Jr; Lanni, C P

An ion gauge is disclosed having a reduced x-ray limit and means for measuring that limit. The gauge comprises an ion gauge of the Bayard-Alpert type having a short collector and having means for varying the grid-collector voltage. The x-ray limit (i.e. the collector current resulting from x-rays striking the collector) may then be determined by the formula: I/sub x/ = ..cap alpha..I/sub l/ - I/sub h//..cap alpha.. - l where: I/sub x/ = x-ray limit, I/sub l/ and I/sub h/ = the collector current at the lower and higher grid voltage respectively; and, ..cap alpha.. = the ratio of the collector current due to positive ions at the higher voltage to that at the lower voltage.

• DOE Contract Number: EY-76-C-02-0016
• Assignee: Dept. of Energy
• OSTI ID: 6763681
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BAYARD-ALPERT GAGES
DESIGN
MEASURING INSTRUMENTS
PRESSURE MEASUREMENT
X RADIATION
ELECTROMAGNETIC RADIATION
IONIZATION GAGES
IONIZING RADIATIONS
PRESSURE GAGES
RADIATIONS
VACUUM GAGES
420700* - Engineering- Vacuum Engineering- (-1987)
440100 - Radiation Instrumentation