Magnetostrictive guided wave technology can realize long distance testing with single point excitation

however

it faces challenges when testing non-ferromagnetic components or components with exposed ends.On the basis of analyzing testing principle of existing magnetostrictive guided wave sensors

firsdy

propose using magnetostrictive effect to generate guided wave in ferromagnetic waveguide tube;and then transfers the wave to component to be tested

and also laboratory platform for principle research on open magnetic circuit magnetostrictive guided wave sensor is built.Longitudinal mode waveguide of 270 kHz is used to detect the notch with 0.5 mm thickness and through-hole defect of Φ5 mm in a 25 mm-diameter

2.5 mm-wall thickness

2800 mmlength low carbon steel pipe

and the sensor also can receive obvious end echo signal in a 25 mm-diameter

2.5 mm-wall thickness

2 800 mm-length stainless steel pipe

which provides basis for further application in detection of non-ferromagnetic or end-exposed component.