Electrodynamically producing ultrasonic waves

Details Electrodynamically producing ultrasonic waves Electrodynamically producing ultrasonic waves

1985-12-11

1988-03-22

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73668, G01N 2904

Patent

active

047320400

ABSTRACT:
An electrodynamic transducing device includes two staggerdly coils with a distance of staggering equal to a quarter of a wavelength of ultrasonic waves; unidirectional transmission characteristics of the transducer is obtained by feeding the two coils separately with HF current at a time difference of feeding of the respective two signals to be equal to a quarter of the wavelength such that a reinforcing ultrasonic signal is produced in the direction of the coil receiving said signal earlier in time and complete cancelation of acoustic waves obtains in the opposite direction, whereby in case of equal pitch of said coils the HF signals are of equal contour but of opposite polarity while in case of opposite winding pitch the signals not only have equal signal contour but also the same polarity.

REFERENCES:
patent: 4232557 (1980-11-01), Vasile
patent: 4295214 (1981-10-01), Thompson
patent: 4471658 (1984-09-01), Morimoto

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