2018 Volume 57 Issue 5 Pages 525-528
Quantitative measurements of ultrasonic velocity is tried from an ultrasonic image data obtained by the strobe photo-elastic method incorporating the sensitive tint method. Lamb wave lunched in the glass around 2 MHz is imaged by the strobe photo elastic method introducing sensitive tint method. Ultrasonic wave field image that were processed with integration, subtraction and normalization was obtained to develop the contrast of image. In the sensitive tint image, the sound pressure polarity of the Lamb wave are indicated by red and blue, respectively. Using RGB data of S1 and A1 images, phase velocity versus frequency is analyzed to the wavenumber by the FFT to obtain the ultrasonic Lamb wave velocity. The agreement between the experiment and the analysis result revealed that this method can quantitatively measure the ultrasonic Lamb wave velocity.
