Contact ultrasonic transducers for mechanical scanning systems

Abstract

In this article the low frequency contact transducers for mechanical scanning systems are considered. The important part of the contact scanning transducer is protector which can be replaceable if it is wearing away. The two kinds of the replaceable protectors are investigated. The first, the planar protector the thickness of which may be from 0.25 mm up to 3.0 mm and the second, the convex protector having the surface of acoustic contact, diameter of which may be from 0 up to 7 mm were made. Ultrasonic signals and their frequency responses are presented for the planar and the convex protectors. The amplitude of ultrasonic signals depends on the thickness of the protector. For the planar protector the amplitude of the ultrasonic signals decreases when the thickness of the protector increases. For the convex protector the amplitude of the ultrasonic signals increases when the planar part of the protector increases.