Ultrasonic wave generation and detection with long pulse lasers

摘要

it was a process and a device for generating and detecting ultrasound in a workpiece using a langimpulslasers developed. a laser beam on a workpiece gepulster win is judged.the pulse duration is defined as the time of propagation of ultrasound from a erzeugungsort to a workpiece, issues of fault or discontinuity and then to a nachweisort, or the time of propagation of ultrasound directly from the nachweisort erzeugungsort.a second gepulster laser beam with a pulse duration that is longer than the ultraschallausbreitungszeit, is also directed at the workpiece.after the reception of light from the second pulsed laser beam phasenmoduliertem, of the workpiece reflected or dispersed light is phasenmoduliertes demodulates to a demodulationssignal to receive the ultraschallbewegung systems on the surface of the workpiece sentativ. the demodulationssignal is then processed electronically.