Ultrasonic scanning probe with a tuning fork-type oscillator and feedback control thereof

摘要

A mechanical scanning device is composed of an oscillating beam onto which a transducer is mounted, part of which is flexible such that the beam will oscillate at a frequency between 8 and 15 Hz when mechanically energized. To sustain oscillations, energy is supplied by means of two electromagnetic coils acting on two permanent magnets mounted on either side of the beam. In order to improve the linear performance of the probe, feedback control was employed. A position sensor along with supporting electronics was designed to provide control signal for the feedback system.

主权项

1. An ultrasonic transducer device for performing an optical scan on the eye of a patient comprising:
a frame; a sonic transducer generating waves; a main beam having a free end supporting said sonic transducer and a support point opposite said free end, said support point being secured to said frame; and a driving mechanism disposed between said free end and said support point and driving said main beam in a reciprocating angular motion said sonic transducer being adapted to direct said waves at the patient's eye as said sonic transducer is being reciprocated on said main beam to scan the patient's eye.