Helium Research Center internal report
an RC bridge and detector for the measurement of small capacitance changes
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Author
Contributions
- Gordon, J.L. - Contributor
- United States. Bureau of Mines - Contributor
- Helium Research Center (United States. Bureau of Mines). Branch of Fundamental Research - Contributor
Publication
1964 - U.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services, Amarillo, Tex, Texas
Language
English
Word Count
4,250 words, Guess
Page Count
17 pages
Identifiers
- Internet Archiveheliumresearchce00mcve_1
- OCLC Control Number914909380
- Open LibraryOL27329540M
Alternate Titles
- Bureau of Mines, Helium Activity, Helium Research Center Internal Report
- RC bridge and detector for the measurement of small capacitance changes
Description
An instrument for the purpose of detecting small changes in air dielectric capacitance is described. It consists of an RC bridge circuit with the associated power supply and detector. The bridge has a 26 VAC input and sine wave output which is compared with a square wave in the detector. The dc output from the detector is a measure of bridge unbalance in millivolts, with a minimum sensitivity of 10́℗đ pico-farads at 200 pico-farads. The bridge and detector assembly were designed to monitor the rate of diffusion of gases and were used successfully for this purpose. A small change in gas mixture composition changes the gas-dielectric constant; therefore, the capacitance value of a small air-type capacitor inserted into the gas mixture changes proportionally, and is recorded as a function of time.
Subjects
Topics
Series Statement
- Helium Research Center Internal Report / U.S. Department of the Interior, Bureau of Mines -- no. 51
- Helium Research Center Internal Report (United States. Bureau of Mines) -- no. 51.
Other Editions
- Helium Research Center internal report
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