Circumferential wave guide energy converter with adjustable incident angle

Abstract

The invention discloses a circumferential wave guide energy converter with an adjustable incident angle for realizing ultrasonic testing of the whole tube of the each small diameter tube of various types of power station boilers on a smaller contact surface. A piezoelectric wafer of the energy converter is stuck and fixed on a slide block; the slide block can move along the arc surface of a transparent wedge block; the transparent wedge block matches with a match block, so that ultrasonic wave rectilinearly propagates in a organic glass before propagating into a tube to be tested, and incidence point thereof is just at the symmetric point of the arc inner surface of the match block. By adjusting the incident angle of the ultrasonic wave, the incident ultrasonic wave is refracted on the outer interface of the small tube to be tested, regular polygonal ultrasonic wave preparation channel is formed in a metal medium, and under the state of no defect, the ultrasonic wave returns to the energy converter at the incidence point by the means that the perimeter of the regular polygon is taken as a single beam path, and is received. The energy converter solves the technical problem that a heating surface tube panel can not be completely tested with the ultrasonic technology on the spot.

Description

technical field [0001] The invention relates to a non-destructive flaw detection transducer, in particular to a circumferential ultrasonic guided wave transducer with adjustable incident angle, which realizes the detection of the whole tube of small-diameter tubes of power plant boilers of various specifications on a small contact surface. Ultrasonic testing. Background technique [0002] There are mainly two types of structures of the existing ultrasonic guided wave transducers: (1) One is a single transducer structure. It includes a piezoelectric chip and a cylindrical plexiglass acoustic wedge. Its working principle is to set a probe ultrasonic guided wave reflection conical surface at one end of the cylindrical plexiglass acoustic wedge, and use an outer diameter that matches the inner diameter of the pipeline to be inspected. Its essence is shear wave flaw detection. Each transducer can only be applied to the detection of pipes of a certain specification, and has a la...

AI Technical Summary

Problems solved by technology

The heating surface tube is characterized by small diameter and thin wall. When forming a tube panel, due to the small tube spacing, the area where the detection sensor can be placed is very small, and the ultrasonic sensor can only move within 1 / 3 of the circle. Ultrasonic sensors are difficult to conduct a comprehensive inspection of the heating surface tube panel

Images