Ultra-sensitive force detector employing servo-stabilized tunneling junction
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United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Nov 5, 1990
filing date -
Nov 5, 1990
priority date (Note) -
Expired
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Abstract
A highly sensitive force detector using a tunneling junction as a strain gauge is disclosed. The tunneling junction is connected to a deflection member which receives the force to be measured. The junction is connected in a nulling circuit to a magnetic flux motor which generates a restoring force precisely equal to the force to be measured. The magnetic flux required by the flux motor to do so is measured by a SQUID, the output of which is directly proportional to the flux to be measured. The device has applications in pressure sensing, weighing, gravity measurements, detection of massive objects, and elsewhere.
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