Process for automatically adjusting the frequency of piezoelectr

Details Process for automatically adjusting the frequency of piezoelectr Process for automatically adjusting the frequency of piezoelectr

1976-09-09

1977-12-13

Smith, Al Lawrence

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

29 2535, 29593, 51413, B24B 100, B24C 100, G01J 1700

Patent

active

040621545

ABSTRACT:
A process for automatically adjusting the frequency of a piezoelectric reator in the form of a bar or plate includes the steps of applying a voltage to the resonator to cause it to resonate, measuring the frequency of the resonator continuously during a frequency adjusting cycle, continuously comparing the measured frequency with a desired frequency to obtain a difference frequency value, storing the difference frequency value at the beginning of the adjusting cycle, deriving from the difference frequency value a threshold value equal to one-half of the difference frequency value, comparing the threshold value with the frequency difference value, removing material by a sand blast from a first extremity of the resonator as long as the difference frequency value is greater than the threshold value and thereafter removing material from the other extremity of the resonator until the difference frequency value is nil.

REFERENCES:
patent: 3453781 (1969-07-01), Greenman
patent: 3589081 (1971-06-01), Kilischenko
patent: 3665570 (1972-05-01), Brooks
patent: 3691695 (1972-09-01), Green
patent: 3702042 (1972-11-01), Cochran
patent: 3808752 (1974-05-01), Beaver
patent: 3829962 (1974-08-01), Simonelic

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