Research on quantitative stress measurement method of wave field radiated from an ultrasonic transducer

A novel method is proposed for the quantitative stress measurement of wave field in transparent solid radiated from an ultrasonic transducer. Filtered Back Projection algorithm is used to reconstruct the stress field taking account of the accumulation of the birefringence effect from a laser beam and the difference between inhomogeneity of real stress field and homogeneity assumption of observed stress with Senarmont compensation method based on a dynamic photo-elastic measurement system. The reconstructed stress data is dynamically calibrated with 4 different electrical excitatory voltages to ultrasonic transducer according to linear function of stress amplitude against excitatory voltage. The measurement of radial stress field of longitudinal transient wave from a circular wafer transducer is experimentally made, which verifies that the stress amplitude is proportional to the excitatory voltage with agreement to linear function.