Thanks for the reply.
I am using Ultrasonic Pulser-Receivers 5072PR (Olympus NDT INC, USA) which connected to an oscilloscope PicoScope 5204 (Pico Technology, UK) and a personal computer via USB 2.0 port running PicoScopeÒ6 software. A 10 MHz (V129-RM) and 20 MHz (V116-RM) ultrasound contact transducer (Panametric, Olympus NDT INC, USA) is used for doing experiments.
Waiting for your response
I will upload a video clip of the echo and its changes within time.