Progress Report No. 2 on Contract NObs-88181 (Texas Univ, Austin)
Progress rept. no. 2, 1 Jan-31 Mar 1963
TEXAS UNIV AT AUSTIN DEFENSE RESEARCH LAB
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Efforts were continued on the construction of an electrical analog device to plot automatically acoustical and mechanical impedances. Measured values of acoustic impedance of a resistive acoustic termination unit are given for the complete unit and for the unit in various stages of disassembly. The desired impedance magnitude for the complete unit prevailed at only two frequencies within the range of measurement. Findings of tests to check an impedance head hydrophone are reported. Results of two different, but related, hydrophone calibration methods were in disagreement by about 3 dB. Use of acoustic admittance parameters of pipe fittings, flow line irregularities, and acoustic filter branch elements in transforming acoustic load admittances toward the source past lossless elements is discussed.
- Acoustic Detection and Detectors