Stress wave load cell

Details Stress wave load cell Stress wave load cell

1990-02-15

1991-04-02

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

7386259, G01G 314, G01L 110

Patent

active

050040596

ABSTRACT:
A stress wave load cell comprises a propagation member to which is acoustically coupled a transmitting transducer and a receiving transducer. Electrical pulses are supplied to the transducer form a pulse generator and the electrical pulses are converted into stress wave signals which propagate through the propagation member. The transducer detects the stress wave after propagation through the propagation member and supplies an electrical signal to a processor which gives a measure fo the load applied on the load cell.
Damping members apply a damping load on the propagation member 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 decay rate of the diffuse stress wave field set up in the propagation member is dependent upon the load applied on the load cell.

REFERENCES:
patent: 3812345 (1974-05-01), Stone
patent: 3855847 (1974-12-01), Leschek
patent: 3915017 (1975-10-01), Robinson
patent: 4317368 (1982-03-01), McElroy
patent: 4701866 (1987-10-01), Harrison et al.
patent: 4782701 (1988-11-01), Proctor, Jr.

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