Ultrasonic scattering technique for target size measurement

We present in this paper a new ultrasonic method for sizing immersed wires (or more generally any kind of target shape). By extracting the first part of its backscattered echo, which gives what we call the quasi-rigid backscattered echo (QRBE), the size of a wire can be found by comparing its QRBE spectrum with the quasi-rigid form function (QRFF). The principal advantage of the QRFF in comparison with the form function is to be almost insensitive to the target's acoustical properties. After some theoretical aspects, we present step by step our sizing method using ultrasonic scattering. Some experimental results of wire sizing are presented.