Transducer

Details Transducer Transducer

1987-07-02

1990-09-04

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

733365, 336 30, 361283, B60C 2302, G01L 912

Patent

active

049533932

ABSTRACT:
A passive electrically operable monitoring means has an inherent resistance and a characteristic capacitance and inductance only, so that the monitoring means has a predetermined natural frequency of oscillation. Variations in a physical parameter being monitored by the monitoring means will cause the characteristic capacitance and/or inductance to vary thereby varying the natural frequency of oscillation of the monitoring means. A transducer includes an excitation means for exciting the monitoring means and a sensing means for sensing the natural frequency of oscillation of the monitoring means. The excitation means includes a pulse generating means for exciting the monitoring means with a string of pulses having a repetition rate suitably lower than the natural frequency of oscillation of the monitoring means so that damped oscillations occur in the monitoring means.

REFERENCES:
patent: 2982127 (1961-05-01), Scott
patent: 4233523 (1980-11-01), Jarder
patent: 4335608 (1982-06-01), Wood
patent: 4389884 (1983-06-01), Agulia
patent: 4409586 (1983-10-01), Hochstein
patent: 4578992 (1986-04-01), Galasko

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