Self-modulating pressure gauge

Title: Self-modulating pressure gauge

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Abstract

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.

Inventors:: Edwards, D. Jr.; Lanni, C.P.

Issue Date:: 1979-08-07

OSTI Identifier:: 6763681

Assignee:: Dept. of Energy TIC; ERA-06-006403; EDB-81-011645

DOE Contract Number:: EY-76-C-02-0016

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 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

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                    Edwards, D. Jr., and Lanni, C.P. Self-modulating pressure gauge.  United States: N. p., 1979. 
        Web.

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                    Edwards, D. Jr., & Lanni, C.P. Self-modulating pressure gauge.  United States.

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                    Edwards, D. Jr., and Lanni, C.P. Tue .  
        "Self-modulating pressure gauge".  United States.

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@article{osti_6763681,

  title        = {Self-modulating pressure gauge},

  author       = {Edwards, D. Jr. and Lanni, C.P.},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1979},

  month        = {8}

}

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Self-modulating ion gauge

Journal Article Edwards, D. Jr.; Lanni, C. - J. Vac. Sci. Technol.; (United States)

A Bayard--Alpert ionization pressure gauge has been modified by shortening the collector wire thereby reducing the x-ray limit from approx.2.5 x 10/sup -11/ to approx.0.6 x 10/sup -11/ Torr. In addition it has proven possible to modulate this gauge and thus make an in situ determination of the x-ray limit without the introduction of a modulation electrode. Thus a self-modulating, low x-ray limit ion gauge has been developed at reasonably low cost and seems particularly suited to the ISABELLE ultrahigh vacuum system.
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