Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1999-01-15
2000-08-01
Kwok, Helen C.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73652, G01V 116
Patent
active
060949910
ABSTRACT:
A self-orienting motion sensor in which an inner housing, preferably spherical, is free to rotate within a cavity, also preferably spherical, resting on a support in an outer housing. The inner housing has a preferred orientation due to the center of gravity being lower than the rotational center of the inner housing. Motion sensing elements are arranged within the inner housing to measure at least one and preferably three directions of motion. A signal transfer mechanism transfers signals to a recorder. The inner housing may include a magnet to orient it in a defined relation to the earth's magnetic field and the housing may be provided with ground engaging devices to fix the housing in the ground.
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Mark Products, A Division of Shaw Resource Service, Inc., G-210 Gimbal Mounted, High Performance Geophone, brochure.
Western Atlas International, A Litton/Dresser Company, LRS-1025 High-Temperature 2-D Gimbal Geophone, brochure, 1989.
Release entitled "NETCO, LLC Principal Granted Third Patent on New Seismic Signal Technology", Nov. 25, 1996.
Bertram Malcolm B.
Gallant Eric V.
Stewart Robert R.
Kwok Helen C.
Lambert Anthony R.
University Technologies International Inc.
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