A Simplified Ultrasonic Time‐Delay Spectrometry (TDS) System Employing Digital Processing to Minimize Hardware Requirements

Time delay spectrometry (TDS) is a swept‐frequency technique that has proven useful in several ultrasonic applications. The research systems that have been used depended on features of commercial equipment no longer manufactured; commercial TDS ultrasonic systems are not available. The system described here is easy to replicate with readily available equipment and a digitizer and computer capable of handling audio frequency signals. Two applications are shown to demonstrate the capability of this design.