NASA NTRS · 19800000377
Ultrasonic frequency analysis
Abstract
Technique is used for evaluation and characterization of materials, fluids, and biological tissue. Method eliminates problem of electrical drive pulse shape by slaving tracking generator to local oscillator of spectrum analyzer. Logic/timing generator is used to control pulse transmission and receiving sequence, pulse width, and pulse repetition rate.
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Cantrell, J. H., Heyman, J. S.. 1981-01-01. Ultrasonic frequency analysis. https://ntrs.nasa.gov/citations/19800000377
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