A Low-Noise Hydrophone Preamplifier for Experiments with Explosive Sound Sources

摘要

The hydrophone-preamplifier described has a frequency band from a few hertz to above 50 kHz, a voltage gain of 6 dB, and a maximum input voltage for linear operation of 10 V peak-to-peak; it is therefore particularly suitable for experiments with explosive sound sources. Its very low equivalent input noise permits the acquisition of signals only just above zero-sea-state noise level, its input dynamic range of better than 130 dB allows its use with a digital recording system, and its 100 megohm input impedance make it suitable for low frequency signals even when using low-capacitance hydrophones. (Author)