Stress wave load cell

Details Stress wave load cell Stress wave load cell

1990-02-16

1991-05-21

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

73599, G01L 100

Patent

active

050164805

ABSTRACT:
A stress wave load cell comprises a propagation member to which is acoustically coupled a transducer. Electrical pulses are supplied to the transducer from a pulse generator and the electrical pulses are converted into stress wave signals which propagate through the propagation member. The transducer also detects the stress waves after propagation through the propagation member and supplies an electrical signal to processor which gives a measure of the load applied to the load cell.
Damping members which have profiled surfaces are caused to move into damping contact with the propagation members when a load is applied to the load cell. The damping members damp the propagation of the stress waves in the propagation member and the damping is proportional to the area of damping contact, the area of damping contact increases with the load applied. May be used to measure tensile load or compressive load and may be used as a touch sensitive panel.

REFERENCES:
patent: 3153338 (1964-10-01), Kleesattel
patent: 3967497 (1976-07-01), Brown
patent: 3977242 (1976-08-01), Brown
patent: 4604612 (1986-08-01), Watkins et al.
patent: 4679430 (1987-07-01), Scott-Kestin et al.
patent: 4712037 (1987-12-01), Verbeek et al.

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