International Journal of Engineering and Technology

This paper deals with the estimation of width of top of sub assembly ring using Pulse Echo Ultrasonic Technique. Due to the effect of beam spread, the ring appears to be magnified in its width. 6db drop in amplitude and 6db drop from edges have been applied to estimate width of the object using two different transducers kept at different distances from the object. Better results are obtained for the transducer kept close to the object but in the far field region. Error of 0.8mm and error of 0.6mm has been obtained with the two techniques of 6db drop in amplitude and from 6db drop from edges.