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Title: 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:
 [1]
  1. (Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
864800
Patent Number(s):
4420974
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
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 = {1983},
month = {1}
}

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