Based on the magnetostriction of ferromagnetic material

a kind of magnetostrictive sensor for damage detection in a nonferromagnetic plate is proposed.The sensor is composed of a transmitter and a receiver

which both consist of a figure-of-eight coil

a nickel strip and a couple of bias permanent magnets.The transmitter generates guided wave in the plate according to magnetostrictive effect

and then it propagates in the plate and is reflected by the damages and edges of the plate.Then based on the inverse magnetostrictive effect

the receiver catches the wave signal.According to the reach time of the reflected wave signal and the velocity of the generated wave

the location of the damage in the plate can be identified.Changing the direction of constant bias magnetic field can transmit different wave mode in the plate.Experiment results show that the magnetostrictive sensor is feasible

and it is cost-effective and non-contact.