Digital output force sensor using surface acoustic waves

Details Digital output force sensor using surface acoustic waves Digital output force sensor using surface acoustic waves

H - Electricity

03

H

349/59.1

H03H 9/00 (2006.01) G01L 1/16 (2006.01) G01N 3/06 (2006.01) G10K 11/36 (2006.01)

Patent

CA 1100620

D-5881 ABSTRACT OF THE DISCLOSURE A sensor developing a digital output in response to force induced deflection in which the deflection is of a beam formed to have, under stress, a surface undulate in both compression and tension. The signal is developed from piezo- electric transducers connected in a pair of oscillator circuits utilizing surface acoustic wave paths through, respectively, the tension and the compression portions of the beam surface. The frequencies of the oscillators are compared and the fre- quency difference resulting from beam deflection is sent as a signal to a counter to give a digital read out of the force causing the deflection. The beam is formed of steel and the piezoelectric surface for the surface waves and the interdig- itated conductors forming the transducers are deposited by thin film techniques on the beam.

293340

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