High temperature fluid flow speed detection apparatus
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United States of America Patent
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-
Jul 5, 1988
Grant Date -
N/A
app pub date -
Aug 4, 1986
filing date -
Aug 20, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A speed detection apparatus intended to be placed in a borehole containing high temperature flowing fluid consists of an elongated casing with a rotary shaft having a helical rotary blade in the casing. Secured to the rotary shaft is a sensor control rotor with a plurality of metal targets on the periphery. Opposed to these targets is an eddy currents displacement transducer with electric circuitry including a coil. The displacement of the targets due to fluid flow causes impedance change in the coil which produces an electrical signal proportional to the rate of flow.
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