Transducer

Details Transducer Transducer

G - Physics

01

D

73/69

G01D 5/243 (2006.01) G01K 7/34 (2006.01) G01L 9/00 (2006.01) G01L 17/00 (2006.01) G01N 27/00 (2006.01)

Patent

CA 1302730

A B S T R A C T A passive electrically operable monitoring means has an inherent resistance and a characteristic capacitance and inductance only, so that the monitoring means has d 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 monito- ring 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 monito- ring means.

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