Ultra-sensitive force detector employing servo-stabilized tunnel

Details Ultra-sensitive force detector employing servo-stabilized tunnel Ultra-sensitive force detector employing servo-stabilized tunnel

1990-11-05

1992-04-14

Eisenzopf, Reinhard J.

Measuring and testing

Dynamometers

Responsive to force

73701, 505842, 324248, G01L 108

Patent

active

051036827

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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Binnig et al., "Tunneling Through a Controllable Vacuum Gap", Appl. Phys. tt., 40, 178 (1982).
Moreland et al., "Electromagnetic Squeezer for Compressing Squeezable Electron Tunneling Junctions", Rev. Sci. Inst. 55(3), 1984.
Moreland et al., "Squeezable Electron Tunneling Junctions", Applied Physics Letters, 43(4), 1983.
Moreland et al., "Electron Tunneling Experiments Using Nb-Sn `Break` Junctions", Journal of Applied Physics, 58(10), (1985).
Binnig et al., "Atomic Force Microscope", Phys. Rev. Lett., 56, 9, 3 Mar. 1986, pp. 930-933.

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