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Title Head assembly for multiposition borehole extensometer
Creator/Author Frank, D.N.
Publication Date1981 Jun 09
OSTI IdentifierOSTI ID: 5252201; DE82011755
DOE Contract NumberW-7405-ENG-48
Resource TypePatent
Subject440300 -- Miscellaneous Instruments-- (-1989) ;010404 -- Coal, Lignite, & Peat-- Gasification ;020300 -- Petroleum-- Drilling & Production ;020400 -- Petroleum-- Processing; ;BOREHOLES-- EXTENSOMETERS;EXTENSOMETERS-- DESIGN;GROUND SUBSIDENCE-- MEASURING INSTRUMENTS; ANCHORS;PIPES;POTENTIOMETERS;RODS;WHEELS
Related SubjectCAVITIES;ELECTRIC MEASURING INSTRUMENTS;ELECTRICAL EQUIPMENT;EQUIPMENT;MEASURING INSTRUMENTS
Description/Abstract A head assembly for a borehole extensometer and an improved extensometer for measuring subsurface subsidence.^A plurality of inflatable anchors provide discrete measurement points.^A metering rod is fixed to each of the anchors which are displaced when subsidence occurs, thereby translating the attached rod.^The head assembly includes a sprocket wheel rotatably mounted on a standpipe and engaged by a chain which is connected at one end to the metering rod and at the other end to a counterweight.^A second sprocket wheel connected to the standpipe also engages the chain and drives a connected potentiometer.^The head assembly converts the linear displacement of the metering rod to the rotary motion of the second sprocket wheel, which is measured by the potentiometer, producing a continuous electrical output.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 9
AvailabilityNTIS, PC A02/MF A01.
RightsDept. of Energy
System Entry Date2001 May 13

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