In-situ measurement system
Abstract
A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop "hairpin" configuration of shorter length than the other resistance elements. The resistance elements are arranged in pairs in a unitized structure, and grouted in place in the underground volume. The electrical resistance of each element and the difference in electrical resistance of the paired elements are obtained, which difference values may be used in analytical methods involving resistance as a function of temperature. A scanner sequentially connects the resistance-measuring apparatus to each individual pair of elements. A source of heating current is also selectively connectable for heating the elements to an initial predetermined temperature prior to electrical resistance measurements when used as an anemometer.
- Inventors:
-
- Livermore, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- OSTI Identifier:
- 864800
- Patent Number(s):
- 4420974
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01F - MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL
G - PHYSICS G01 - MEASURING G01K - MEASURING TEMPERATURE
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- in-situ; measurement; multipurpose; situ; underground; comprising; plurality; electrical; resistance; elements; form; rigid; reinforcing; bars; loop; hairpin; configuration; shorter; length; arranged; pairs; unitized; structure; grouted; volume; element; difference; paired; obtained; values; analytical; methods; involving; function; temperature; scanner; sequentially; connects; resistance-measuring; apparatus; individual; pair; source; heating; current; selectively; connectable; initial; predetermined; prior; measurements; anemometer; electrical resistance; predetermined temperature; shorter length; situ underground; situ measurement; resistance element; resistance measurements; measuring apparatus; heating current; temperature prior; resistance measurement; selectively connect; reinforcing bar; /73/338/374/
Citation Formats
Lord, David E. In-situ measurement system. United States: N. p., 1983.
Web.
Lord, David E. In-situ measurement system. United States.
Lord, David E. Sat .
"In-situ measurement system". United States. https://www.osti.gov/servlets/purl/864800.
@article{osti_864800,
title = {In-situ measurement system},
author = {Lord, David E},
abstractNote = {A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop "hairpin" configuration of shorter length than the other resistance elements. The resistance elements are arranged in pairs in a unitized structure, and grouted in place in the underground volume. The electrical resistance of each element and the difference in electrical resistance of the paired elements are obtained, which difference values may be used in analytical methods involving resistance as a function of temperature. A scanner sequentially connects the resistance-measuring apparatus to each individual pair of elements. A source of heating current is also selectively connectable for heating the elements to an initial predetermined temperature prior to electrical resistance measurements when used as an anemometer.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}