A saturated parametric acoustic receiver

Abstract

An analysis is presented for a saturated parametric acoustic receiver that is based on the fact, first derived by Fenlon for low-amplitude waves [J. Acoust. Soc. Am. 51, 284–289 (1972)], that saturation loss for the sum- and difference-frequency components is essentially the same as that of the pump frequency alone. After extension of this result to high-amplitude waves, the theory of Rogers, Williams, and Barber [Nav. Res. Lab. Rep. 7484 (29 December 1972)] is then modified to account for saturation. Experimental data showing the validity of this approach are presented.

Application of Parametric Acoustic Receiving Array to Underwater Acoustic Measurement

“…The distance from source and pump transducer to hydrophone is 3λ s and 2λ s , respectively. From equation (5), θ B = 57.2°. Apparently, the mirror reflection of source signal from surface will be totally suppressed by the parametric receiving array if it reaches the hydrophone at this angle, which means h = 2.3λ s in fig.…”

“…Above analysis of the method by using parametric receiving array is based on equation (5). But equation ( 5) is only suitable for the source position far away from the pump transducer and the hydrophone, in order that the source signal can be assumed as plane wave signal within the area of parametric receiving array.…”