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Patent
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G01L 1/10 (2006.01) E21B 49/00 (2006.01) G01B 7/16 (2006.01)
Patent
CA 1271647
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 diametrically opposed portions of the borehole wall.
596032
Herget Gerhard H.
Kapeller Frank
Her Majesty The Queen In Right Of Canada As Represented By The Minister Of Natural Res
Herget Gerhard H.
Kapeller Frank
Macrae & Co.
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