For more clarification, please let me describe my experiment. As shown in the uploaded picture , a sample which is a two-layered composite is undergoing loading and unloading mechanical test and at the same time the ultrasound echoes is going to be captured. The echo captured before start loading/unloading is shpown in picture 1. The echoes reflected from surface 1 and surface 2 is shown in the picture 1. As the loading/unloading experiment starts, the echo starts changing through the whole loading/unloading time. The video clip uploaded in this link: https://drive.google.com/open?id=0B16cj ... GxZRGliSG8
shows the changes of the reflected echoes from surface 1 and 2 within the time of loading/unloading.
Now, what I am going to do is to capture the change in amplitude of the reflected echoes from surface 1,2 (refer to marked points c,d,e,f in Picture 2) and also the change in time (refer to marked points a,b in picture 2).
I need to record these changes within the time of the experiment for further analysis. Hope it is clear now.
Look forward to hearing from you