I'm thinking about experimenting with an ultrasonic sensor to detect small cracks in used ammo brass cases, before reloading. I've seen at work pretty sophisticated inspection instruments, but I would like to experiment what results I can get using cheap parts, like this: http://www.ebay.com/itm/New-1set-16mm-40khz-Waterproof-Ultrasonic-Sensor-Receiver-Transmitter-1R-1T-/300669157830?pt=LH_DefaultDomain_0&hash=item46014741c6
The idea is to place the case (butt down) on the sensor, using some gel to get better sound propagation, and the use the Arduino to compare the echo pattern of a new case vs used ones.
Is there a chance that this works using this type of sensor or am I too ambitious??? Should I use other type of sensors? Thanks in Advance