Prototype Portable Ultrasonic Spectroscope Open PDF Document Details Document Type Technical Report Publication Date May 01, 1973 Accession Number AD0766310 Entities People Brian J. Spencer Gerald M. Elfbaum Jean L. Hunerwadel Kenneth A. Fowler Tags Communities of Interest Advanced Electronics DTIC Thesaurus Topics Abstracts Amplifiers Amplitude Bandwidth Control Knobs Electrical Impedance Frequency Generators Impedance Measurement Oscillators Radio Frequency Oscillators Repetition Rate Spectrum Analysis Spectrum Analyzers Time Domain Toggle Switches