Using this system, two steps must be taken in preparation:
Zeroing /determining the distance between the transducers and calibration with a reference sample of exact known thickness.
Important: Samples must have reasonable smooth but parallel surfaces. If the sample surface is not exactly perpendicular to the sound puls, the sound pulse is deviated and lower performance is the end result.
For mass production often a small sub part is casted which is cut off from the casting and which is used for analysis. These small parts can be easily tested with the accessory tool which is made for a small water tank.
Depending on the thickness the transducers can be positioned a different distance.
For in line applications at least a part of the product must be suitable to carry out this measurement including proper positioning in relation to the two transducers so the principle can be applied. Additional mechanical handling with be required.
Transducers can be made in various frequencies, diameters, focussed or not, all depending on the application.
On the monitor a window as below is seen: It shows both water paths (only as indicative information) , the calculated thickness and in the middle the calculated sound velocity of the sample . High and low alarm is possible for external alarm.