A shaped PVDF hydrophone for producing low sidelobe beampatterns

The authors determine if a multi-wavelength continuous hydrophone, shaped to achieve low sidelobes, can produce desired sidelobes and beamwidths. Polyvinylidene fluoride (PVDF) was selected as the sensor material. Theoretical beampatterns are calculated for three different hydrophone shapes (or weig...

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Bibliographic Details
Published inProceedings of the 1992 Symposium on Autonomous Underwater Vehicle Technology pp. 219 - 223
Main Authors Hughes, W.J., Allen, C.W.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1992
Subjects
Acoustic arrays
Acoustic sensors
Apertures
Chebyshev approximation
Etching
Piezoelectric materials
Sensor arrays
Shape measurement
Sonar equipment
Underwater vehicles
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Summary:The authors determine if a multi-wavelength continuous hydrophone, shaped to achieve low sidelobes, can produce desired sidelobes and beamwidths. Polyvinylidene fluoride (PVDF) was selected as the sensor material. Theoretical beampatterns are calculated for three different hydrophone shapes (or weighting functions). They are the rectangular aperture, the modified linear taper, and a -40 dB, 26-point Chebyshev aperture. The beampatterns are calculated using the summation of weighted discrete elements as an approximation. The approximation is validated by comparing the element summation results of the modified linear taper case to its exact solution using Fourier transforms. Measured beampatterns of a rectangular aperture hydrophone and a modified linear taper shaped hydrophone are compared to the theoretical beampatterns.< >
ISBN:0780307046
9780780307049
DOI:10.1109/AUV.1992.225214