Method for contactless determination of hardness depth of motor vehicle bearing journal, involves detecting operating time of ultrasonic wave, obtaining signal of wave during excitation of impulse, and strengthening signal amplitude

摘要

The method involves focusing and splitting a pulsed laser radiation (2), and producing ring shaped ultrasonic impulse excitation consisting of individual lines. A middle excitation point of the ultrasonic impulse excitation is shielded. Operating time of an ultrasonic wave, which is reflected at boundary layers by hardened and unhardened materials, is detected at a center point of the ultrasonic impulse excitation. A signal of ultrasonic wave to be detected is obtained during excitation of the ultrasonic impulse, and signal amplitude is strengthened. An independent claim is also included for a measuring system comprising a scanner unit.