Phase Calibration of Acoustic-Electronic Systems,
ELECTRO NUCLEAR SYSTEMS CORP BETHESDA M
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The object of this report is to present the approach to, mechanics of, and progress to date of performing phase calibrations of the measurement systems used to acquire radiated noise signals for the Acoustic signal processing research program. The following preliminary conclusions may be drawn By phase measurement of a narrow-band amplifier in the laboratory, the technique of recording and measurement has been shown to be satisfactory to measure phase shifts to within or - degrees, from 5 cps to 7 kc the timing counter method of phase calibration used herein is very susceptible to error due to extraneous noise when generating phase calibration tapes it is important to insure that the hydrophones are not subject to vibration and comparison of two sets of phase response measurements for a hydrophone electronic system, made at different times, shows a wide variation in phase characteristics at both ends of its passband. The high frequency variation has not yet been explained due to insufficient data.
- Acoustic Detection and Detectors