Bibliographic Citation
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Title | Head assembly for multiposition borehole extensometer |
Creator/Author | Frank, D.N. |
Publication Date | 1981 Jun 09 |
OSTI Identifier | OSTI ID: 5252201; DE82011755 |
DOE Contract Number | W-7405-ENG-48 |
Resource Type | Patent |
Subject | 440300 -- 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 Subject | CAVITIES;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 Publication | United States |
Language | English |
Format | Pages: 9 |
Availability | NTIS, PC A02/MF A01. |
Rights | Dept. of Energy |
System Entry Date | 2001 May 13 |
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