A two-hydrophone method of eliminating the effects of nonacoustic noise interference in measurements of infrasonic ambient noise levels

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Abstract
Water flow around hydrophones and their cables can induce turbulence, flutter, and bounce noises that interfere with measurements of ambient noise at frequencies of 10 Hz or less. Assuming these noises to be uncorrelated at independently suspended hydrophones and with the ocean ambient noise of interest, it is possible to remove their influence from the result of the ambient noise measurement. Two hydrophones can be suspended independently but closely compared to the wavelength of interest, thereby assuring that the ambient noise is highly correlated. The desired ambient noise level will then be given by the covariance of the two hydrophone signals.

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