Panakkal, J.P.J.P.PanakkalPeukert, H.H.PeukertWillems, H.H.Willems2022-03-082022-03-081989https://publica.fraunhofer.de/handle/publica/316683Ultrasonic velocity and/or attenuation measurement is a versatile tool for nondestructive characterization of material properties such as residual stress, texture, porosity, elastic constants, microstruture etc. In this contribution, an automated, computer-controlled system is described which enables fast and accurate measurement of the time-of-flight of ultrasonic signals as well as the frequency dependent attenuation alpha (f). A high speed digitiser is used for signal recording of the ultrasonic backwall-echoes. The evaluation of the recorded signals is performed involving Fast Fourier Transforms (FFT) for attenuation measurement and cross-correlation technique for time-of-flight measurement. Time resolution better than 1 ns is achieved by applying additional data interpolation. As examples of practical application, the determination of porosity in sintered material and the measurement of grain size in this ferritic sheets are demonstrated.enattenuation measurementgrain sizematerial characterizationmeasurementporosityultrasoundvelocity620658670conference paper