Borehole strain monitor for soft rock
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United States of America Patent
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-
Sep 17, 1991
Grant Date -
N/A
app pub date -
Oct 23, 1989
filing date -
Apr 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A borehole strain monitor for soft rock consisting of a sensing unit, an installation/retrieval provision and a read-out unit. The sensing unit has a U-shaped yoke and is fitted with a vibrating wire transducer. A magnetically coupled variable frequency oscillator determines the point of resonance for the tensioned wire. The resonant frequency is measured with a frequency counter. The sensing unit is used, typically, in boreholes between two and six inches in diameter. The unit is firmly seated in the borehole by means of a pad at one side and a positively guided wedge at the other to bring the unit in contact with diametrially opposed portions of the borehole wall.
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