Structural health monitoring is the method of detecting damage and performance for mechanical structures found in wide variety of application in various fields. Ultrasonic examine is a regime for detection of defects in engineering structures. Here the block is used as a specimen under test. Two ultrasonic transducers are used as transmitter and receiver. The Signal obtained from the receiver will be further processed. Here the block undergoes two significant methods such as pulse echo and through transmission testing. From the data corresponding inference comparison methods is analysed. © Published under licence by IOP Publishing Ltd.