Groundwater pressure measurement
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United States of America Patent
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Feb 21, 1989
Grant Date -
N/A
app pub date -
Mar 25, 1988
filing date -
Mar 25, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus measures changes in groundwater pressure in a borehole. The apparatus comprises: a probe consisting of a hollow tube having a smooth interior surface, an ultrasonic transmitter which emits ultrasonic waves down the interior of the tube, and an ultrasonic receiver which receives and registers the reflected ultrasonic waves; a means to raise and lower the probe so the tube is partially submerged in the groundwater; a means to control the emission of ultrasonic waves; a means to convert the time interval into a distance or pressure measurement; and a means to store or transmit the data.
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