G - Physics – 01 – B
Patent
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G01B 7/16 (2006.01) E21B 47/00 (2006.01) E21B 49/00 (2006.01) E21C 39/00 (2006.01)
Patent
CA 1314411
4242-005 Title: MATERIAL STRESS MONITOR Inventors: CHRISTOPHER J. PRESTON JOHN J. COTTER, JOHN CODRINGTON, DIMITRI FRANTZOS and PIERRE HAMEL ABSTRACT A sensor unit is disclosed for use in monitoring in situ changes in dynamic and static stress properties of any material to be monitored, such as monolithic concrete or underground rock structures. The sensor unit includes a hollow, waterproof tubular body to be inserted into a cylindrical borehole in the material to be monitored. A transducer is mounted within the body, which by means of strain gauges, provides an output signal responsive to deflection of the sidewall of the borehole. The transducer is coupled to the sidewall by means of pressure buttons. A monitor is also disclosed, which comprises the sensor unit, a data collection unit and a data analyzing unit. A method for sensing dynamic and static changes in material stresses is also disclosed.
566248
Codrington John
Cotter John J.
Frantzos Dimitri
Hamel Pierre A.
Preston Christopher J.
Bereskin & Parr
Eti Explosives
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