A photothermal emitter and an EMA receiver of ultrasonic Lamb waves

摘要

Results of an investigation into the general characteristics of ultrasonic Lamb waves that are excited by a photothermal emitter in metallic plates as a function of its geometric and energy parameters are given. A metal surface area heated during irradiation by nanosecond optical pulses is such an ultrasonic emitter. Excited Lamb waves were recorded using a special wide-band EMA receiver. These findings can be used in the development of devices for the noncontact ultrasonic quality control of thin metalware.