Measuring and testing – Dynamometers – Responsive to force
Patent
1986-11-24
1988-04-19
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to force
7386252, 338114, G01L 118, G01L 106, H01C 1012
Patent
active
047381469
ABSTRACT:
A piezoresistive force-measuring element comprises at least two force-introduction plates with an electrical conductor subjected to plastic deformation arranged between them. The force-introduction plates transmit the forces acting on them without mechanical shunting onto the conductor between them. The change of electrical resistance caused by the force sustained can be used to measure force, accompanied by plastic as well as elastic deformation of the conductor. The typically annular or rectangular force-introduction plates can be fitted inside a housing which may include a bridge circuit for determining the resistance change as well as other electronics enabling the device to be used as a transmitter. By placing the conductor in grooves or anchoring it in the pores of the adjacent plates, an essentially hydrostatic loading of the conductor is obtained, bringing an enormous extension of the measuring range while the measuring accuracy is enhanced owing to the reduced hysteresis. The sensitivity and the measuring range can be adjusted by appropriate prior deformation of the conductor. Permanent deformation of the conductor resulting from high loads makes possible subsequent determination of the magnitude of the peak forces acting on the measuring element.
REFERENCES:
patent: 2090188 (1937-08-01), Dahlstrom
patent: 3635077 (1972-01-01), Rauch
"A New Force Sensor with Metal Measuring Grid Transverse to the Lines of Force", Sensor and Actuators, 7 (1985), 223-232.
Yasumoto et al, "A Convenient Technique . . . Manganin Gauge", Jpn. J. Appl. Phys., vol. 19 (9/80), No. 9, pp. 1805-1806.
Baumgartner Hans-Ulrich
Calderara Reto
Sonderegger Hans-Conrad
Weber Peter
Kristal Instrumente A.G.
Ruehl Charles A.
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