Device for measuring the magnitude of a force applied to the fre

Details Device for measuring the magnitude of a force applied to the fre Device for measuring the magnitude of a force applied to the fre

1981-11-23

1983-01-04

Hartary, Joseph W.

Weighing scales

Computer

Electrical

7386267, 340347NT, 364567, 177211, G01G 3142

Patent

active

043668747

ABSTRACT:
The device includes: a set of four strain-gauges mounted on a cantilevered beam, which gauges are electrically connected among themselves in the form of a bridge (9), in a manner such that said bridge produces an output voltage (.DELTA.V) which is a function of the magnitude of the force applied to the beam, when the bridge (9) is supplied with current; a source of voltage (10), designed to supply the bridge (9); an analog-to-digital converter (16), connected to the output of the amplifier (14), with which there is associated a microprocessor (24); and a display unit (13), connected to an output of the microprocessor (24), which is designed to allow the display of a signal that is representative of the magnitude of the force applied to the beam.
In order to eliminate the need for auxiliary stabilizing and compensating circuits, required if a high-quality circuit of this type is to be constructed, the analog-to-digital converter (16) is of the two-slope type encompassing switching mechanisms (19, 20) controlled by the microprocessor (24) in order to use the supply voltage (10) as a reference voltage.

REFERENCES:
patent: 3616690 (1971-11-01), Harden
patent: 3662845 (1972-05-01), Pratt
patent: 3777828 (1973-12-01), Dietemeyer
patent: 3863724 (1975-02-01), Dalia
patent: 3872466 (1975-03-01), Wold
patent: 3951221 (1976-04-01), Rock
patent: 4139892 (1979-02-01), Gudea
patent: 4181946 (1980-01-01), Loshbough
I.E.E.E. Spectrum, vol. 6, No. 10, p. 85 (Oct. 1969).
Electrotechnology, vol. 4, No. 4, pp. 3-6 (Oct. 1976).
Control Engineering, vol. 24, No. 4, pp. 42-44 (Apr. 1977).
D. H. Sheingold, Editor, Analog-Digital Conversion Notes (Analog Devices Inc., Norwood, Mass., pp. 123-124 and 152-156 (1977).
Electronique & Applications Industrielles, No. 237, pp. 28 and 29 (May 1977).
Feinwerktechnik & Messtechnik, vol. 86, No. 1, pp. 30, 31, 32, 33, 34, and 35.

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