Let me explain my need,in laboratory model the depth of water is 50cm and this water depth is constant through out the experiment,below this water the depth of sand will vary with time due to some effect being created, I am to measure the depth of sand below water, while making measurement the water is without motion and there is no turbidity. Can I use the ultra sound principle to measure this sand depth below water, Kindly help me with information and ideas
Wilbertrk
Wilbertrk