Measuring and testing – Borehole or drilling – Downhole test
Patent
1980-11-24
1983-12-20
Stephan, Steven L.
Measuring and testing
Borehole or drilling
Downhole test
73204, 338 25, 338 26, 338260, 374114, 374185, E21B 4900, G01F 168, H01G 304
Patent
active
044209746
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.
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Carlson David V.
Stephan Steven L.
The United States of America as represented by the United States
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