Abstract
A new type of magnetostrictive transducer was devised, which can generate voltage proportional to the velocity of mechanical vibration without attaching any pick-up element outside the transducer. Measurements on the characteristics of this trasducer were carried out in comparison with those of other well-known feedback transducer and proved that the ability of automatic frequency tracking of this transducer is very exellent up to large amplitudes. The present method is also applied with satisfactory to fatigue tests of metals at ultrasonic frequencies.
