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The Use of Broadband Signals for Underwater Acoustic Transducer Calibration
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
A preliminary study of the potential use of broadband signals for underwater acoustic transducer calibration has been made. Emphasis was placed on pulses of a single cycle of a sinusoidal wave as the calibration signal. The experiments involved digital sampling of the current and voltage response waveforms, generating the Fourier transforms of these responses, and combining the transforms to provide the desired calibration curves. The results were considered comparable to those obtained with conventional operational systems, even though smoothing was not applied to the data and even though compromises were required in performing the experiments. Preliminary noise analyses included the development of certain useful probability density functions and cumulative probability distribution functions. Curves to illustrate these probability functions are plotted. Some interpretation of noise effects is given. Future research plans are described briefly.
APPROVED FOR PUBLIC RELEASE