Magnetic prestressing for a d32-mode single crystal ultrasonic transducer

This work describes a 35.9 kHz ultrasonic transducer that incorporates a magnetic arrangement to apply a static-compressive prestress to a d(32)-mode relaxor ferroelectric single crystal drive-element. The magnetic arrangement produces a 22.5 N static-compressive force, inducing a static compression of similar to 630 nm on the drive-element. Operating in air with a continuous-wave 10 V peak drive at similar to 35.9 kHz, the measured resonant peak displacement of the transducers head-mass was 127 nm. This is well within the predicted static compression, thus, the drive-element is protected from damaging tensile stress. Under the same drive conditions and at an axial distance of 10 mm from the face of the head-mass, the measured acoustic pressure was similar to 12 Pa. Analytical and finite element model predictions and the measured behaviour of a prototype device are presented and show good correlation, demonstrating that magnetic prestressing of the drive-element can be a viable alternative to the traditional bolt-clamp.

Automated summary

This work presents a 35.9 kHz ultrasonic transducer with a magnetic arrangement to apply a static-compressive prestress on the drive-element. The magnetic arrangement generates a 22.5 N static-compressive force, resulting in a static compression of about 630 nm on the drive-element. Experimental results show that the transducer operates effectively without causing damaging tensile stress on the drive-element.