Geometrical instruments – Area integrators – Electrical
Patent
1988-01-21
1989-08-01
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33302, 33544, 33DIG2, 73384, G01N 324
Patent
active
048522627
ABSTRACT:
A gauge for measuring in situ the diameter of a borehole in salt or other ft creeping rock types is provided so that changes in borehole structure can be detected. The gauge comprises a cylindrical body insertable lengthwise into a borehole and having an internal channel wherein sensors can be displaced outwardly when air is directed into the gauge, two air displacement sensors located in the channel having slotted keyways at their inner ends which form an orifice proportional to the distance between the sensors, a pneumatic device capable of providing a stream of air into the gauge body, and a flow meter for measuring air flow through the gauge body. The borehole diameter is determined by directing a stream of air into the gauge body and measuring the air flow which will be proportional to the distance between the sensors when displaced outwardly against the borehole walls. The gauge is advantageous in that it does not itself create artificial stresses or deformations in the borehole walls.
REFERENCES:
patent: 2777257 (1957-01-01), Johnson
patent: 2799944 (1957-07-01), McConnell
patent: 2801473 (1957-08-01), Kirk
patent: 3610035 (1971-10-01), Handy
Babcock Clarence O.
Schneider George J.
Koltos E. Philip
Martin, Jr. William D.
United States of America as represented by the Secretary of the
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