Time and Frequency Domain Measurements of Materials with High Ultrasonic Attenuation Using Time Delay Spectroscopy

Time delay spectrometry (TDS) uses a swept frequency source and a tracking receiver in the place of a conventional pulse-echo system for ultrasonic measurements. This technique can directly provide a frequency domain display of amplitude and even phase. Since the signal is of longer duration than that of a pulse-echo system, a large amount of averaging is intrinsic with this method, making it ideally suited for the study of highly attenuating materials