Ultrasonic Vibration Velocity Imaging for Solid Defect Samples Using Laser Probe Method
Keywords:
Ultrasonic imaging, Constant voltage drive, Laser light prob method, Ultrasonic wave, Piezoelectric transducerAbstract
Laser probe method with a constant voltage drive for a piezoelectric transducer is applied to the non-contact ultrasonic imaging method for evaluating defects in a solid sample. The constant voltage driving method for a piezoelectric transducer by the rectangular pulse voltage is the same as our previous papers and can suppress the mechanical ringing of the piezoelectric transducer. The sample to be measured is attached to the vibrating surface of the piezoelectric transducer and is driven by a cycle sinusoidal wave. Ultrasonic wave signal is observed by the laser probe method. Inverse Radon transform is used to obtain the three-dimensional (3D) image after horizontal (2D) projection data acquisitions. As an experimental result, the shape edge of the side wall of the hole in the acrylic disk sample is imaged, and thus the feature and possibilities of detection method for defect are suggested.
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