Piezoelectric audible alarm frequency self-calibration system

Details Piezoelectric audible alarm frequency self-calibration system Piezoelectric audible alarm frequency self-calibration system

1980-01-09

1981-06-23

Waring, Alvin H.

Communications: electrical

Audible indication

Ultrasonic pest control

331116R, G08B 300, H01L 4104, H04R 1700

Patent

active

042753880

ABSTRACT:
A piezoelectric transducer frequency self-calibration system interrogates the transducer by driving it with various frequencies within a specified range while monitoring the transducer output power level. Two threshold frequency points are identified at which the output power level is at a predetermined threshold level less than the expected maximum output level, and the average of these two threshold frequencies is taken to be the optimum frequency.

REFERENCES:
patent: 3569963 (1971-03-01), Mallory
patent: 3743868 (1973-07-01), Kawada
patent: 3967143 (1976-06-01), Watanabe et al.
patent: 4164735 (1979-08-01), Salem

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