SU1185231A1 - Ultrasound converter - Google Patents

Abstract

Ultrasonic transducer comprising a housing and mounted therein waveguide zakreplenkUZTs nym thereon piezoelectric element and a damper, characterized in that, in order to increase the front resolving power, it is provided with an annular retainer, covering the outside of the waveguide made as a plano-convex circular segment, the maximum whose height is equal to the integer number of half-waves of ultrasound in the waveguide material. (L, /, J S Xx / V / 00 SP to O9

Description

2. The converter according to claim 1, which is different in that. The 1185231 waveguide is made in the form of a plane-convex ellipsoid of rotation.

one

The invention relates to anti-stress devices and methods of control and can be used for ultrasonic control of products of complex shape by contact method.

The purpose of the invention is to increase the frontal resolution of the ultrasonic transducer.

FIG. 1 schematically shows a converter, a general view; in fig. 2 - the course of rays in the waveguide of the transducer and the shape of the sound field formed in the product.

The converter consists of a housing 1, a waveguide 2 installed in it, a piezoelectric transducer 3 fixed on it, and a damper 4, and an annular latch 5 whose height is equal to the height of the waveguide 2 covered by a latch outside.

The working surface of the waveguide is made in the form of a plane-convex circular segment, or in the form of a plane-convex rotation ellipse, the maximum height of which is an integer number of ultra-half waves. sound in the waveguide material.

Ultrasonic transducer works as follows.

The converter is installed on the controlled product and serves

electrical signals to the piezoelectric element (not shown). It excites acoustic vibrations which

they propagate along waveguide 2 and fall on its curved surface. At the point of contact, the oscillation transition t from the waveguide to the article, which is favored by the chosen height of the waveguide, is equal to an integer number of half-waves. The area of the contact area is smaller. It is smaller than the area of the piezoelectric element; therefore, for any radius of curvature of the waveguide, this section of the waveguide can be considered as a radiator of significantly smaller dimensions. The signal of the ultrasound beam is limited by the rays incident on the curved surface at small angles (7) 8 °). Since at small angles of incidence the transformation of longitudinal waves into shear is insignificant, predominantly longitudinal waves propagate in the product — narrow, round, slightly divergent, convergent or parallel beam (depending on the waveguide curvature radius).

The proposed transducer has a high resolution due to the formation of narrow directional beams of ultrasound in a controlled product.

Claims (1)

. An ULTRASONIC TRANSDUCER containing a body and a waveguide installed in it with a piezoelectric element and a damper fixed on it, characterized in that, in order to increase the frontal resolution, it is equipped with an annular retainer covering the waveguide outside, made in the form of a plano-convex circular segment, the maximum whose height is equal to an integer number of half-waves of ultrasound in the waveguide material.