(3,1) Drive PVDF acoustic displacement sensor

Caspall, Jayme J.; Caille, Gary W.; Jarzynski, Jacek; McCall, George S.

doi:10.1063/1.50334

Cited by 2 publications

(3 citation statements)

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“…The sensors themselves are flush-mounted on the exterior of the coating. References [29]- [31] discuss the design of velocity sensors for use on compliant baffles for hull- mounted arrays, and [32] presents experimental results using an array of velocity sensors mounted on such a steel backed coating at a U.S. Naval lake-test facility.…”

Section: Layered-hull Modelmentioning

confidence: 99%

“…The interface between sea water and the packed sandy ocean bottom can be approximately modeled as the boundary between two fluids, one of which is absorptive [20], [36]. The reflection coefficient is given by (29) where is the ratio of sand density to water density, and is the index of refraction. The presence of absorption is accounted for by assuming that the index of refraction is complex, i.e., , with .…”

Section: Seabedmentioning

confidence: 99%

“…Note that the bandwidth is limited only by the frequency range over which the input impedance , or equivalently , is approximately constant. Since is independent of frequency in (29), it is restricted only by the range of frequencies over which the fluidfluid model is valid for reflection from the seabed. Fig.…”

Section: Rementioning

confidence: 99%

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Acoustic vector-sensor processing in the presence of a reflecting boundary

Hawkes

Nehorai

2000

IEEE Trans. Signal Process.

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We consider the passive direction-of-arrival (DOA) estimation problem using arrays of acoustic vector sensors located in a fluid at or near a reflecting boundary. We formulate a general measurement model applicable to any planar surface, derive an expression for the Cramér-Rao bound (CRB) on the azimuth and elevation of a single source, and obtain a bound on the mean-square angular error (MSAE). We then examine two applications of great practical interest: hull-mounted and seabed arrays. For the former, we use three models for the hull: an ideal rigid surface for high frequency, an ideal pressure-release surface for low frequency, and a more complex, realistic layered model. For the seabed scenario, we model the ocean floor as an absorptive liquid layer. For each application, we use the CRB, MSAE bound, and beampatterns to quantify the advantages of using velocity and/or vector sensors instead of pressure sensors. For the hull-mounted application, we show that normal component velocity sensors overcome the well-known, low-frequency problem of small pressure signals without the need for an undesirable "stand-off" distance. For the seabed scenario, we also derive a fast wideband estimator of the source location using a single vector sensor.

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Section: Layered-hull Modelmentioning

confidence: 99%

Section: Seabedmentioning

confidence: 99%