Longitudinal wave-transverse wave integrated electromagnetic ultrasonic probe

Abstract

The invention provides a longitudinal wave-transverse wave integrated electromagnetic ultrasonic probe which is composed of a plurality of rectangular magnet sets, two inflection type coils, a signal connecting line and a probe shell, the same magnetic poles of the rectangular magnet sets are arranged in a face-to-face mode, a conductor part of one coil is located under the magnets, and gaps of the coils right face gaps of the magnet sets. The other coil conductor part is located in the magnet gap, and the coil gap is located under the magnet set. The probe is directly close to the surface of a detected test piece, and magnetic lines of force are emitted from N poles of two magnets arranged face to face, penetrate through a gap and return to S poles of two adjacent magnets. A horizontal magnetic field is generated right below the magnets, and a vertical magnetic field is generated between the two magnets. Pulse current is introduced into the two coils respectively and interacts with a horizontal magnetic field to form Lorentz force which is perpendicular to the surface of the metal and is in the same direction, and therefore excitation and receiving of longitudinal waves are achieved in the metal. And the magnetic field interacts with a vertical magnetic field to form Lorentz force which is parallel to the metal surface and is in the same direction, so that excitation and receiving of transverse waves are realized in the metal.

Description

technical field [0001] The invention relates to a non-contact ultrasonic detection technology, in particular to a novel longitudinal wave-transverse wave integrated electromagnetic ultrasonic probe, which can generate ultrasonic longitudinal waves and ultrasonic transverse waves and can be used for the calibration of metal material thickness measurement. Background technique [0002] Because most of the excitation and reception of body waves are generated by traditional piezoelectric ultrasound. The advantages of traditional piezoelectric ultrasound are high sensitivity, high signal-to-noise ratio, simple structure, reliable operation and light weight. The disadvantage is that couplant is required, and the DC response of the output is poor. The electromagnetic ultrasonic has the characteristics of flexible generation of various waveforms, low requirements for the surface quality of the detection workpiece and fast detection speed. At present, there are many researches on th...

AI Technical Summary

Problems solved by technology

The disadvantage is that couplant is required, and the output DC response is poor

Electromagnetic ultrasound has the characteristics of flexible generation of various waveforms, low requirements for the surface quality of the detection workpiece, and fast detection speed. Body wave research is less

Images