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#UDT2019
Why broadband underwater transducers?
Image from unetstack.net
Improved design and manufacturing of low frequency broadband - - PowerPoint PPT Presentation
Improved design and manufacturing of low frequency broadband - - PowerPoint PPT Presentation
Improved design and manufacturing of low frequency broadband underwater transducers Speaker: Andreas Behringer, PhD candidate at University of Amsterdam, The Netherlands #UDT2019 Why broadband underwater transducers? #UDT2019 Image from
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Current transducer technology
Free flooded ring Flextensional
Both types are omnidirectional!
Image from sensortechcanada.com Image from neptune-sonar.co.uk Image from massa.com
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How can we improve on this?
- More bandwidth
- Higher output
- Higher efficiency
- Directionality improves efficiency!
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Getting directionality
Butler, Comsol Conference 2010
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A different approach
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Materializing the idea
- Simulating the structure
in COMSOL
- Exchange the metal for
3D printable plastic
- Scale the structure
- Print and measure
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Measurement setup
Laser Doppler Vibrometer Microphone Array 2.85 cm 24.5 cm = λ@1400 Hz
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Results: Laser Doppler Velocimetry
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Results: Microphone Array
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Conclusions and Outlook
- Asymmetric shell works
- Achieved directionality at subwavelength scale
Further work:
- Build prototype in metal
- Optimize structure for higher bandwidth
- Improve directionality
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Thank you for your attention!
Speaker: Andreas Behringer, PhD candidate at UvA, Netherlands Co-Authors: S.P. Beerens, TNO, Netherlands
- E. van der Spek, DMO, Netherlands
- R. Sprik, UvA, Netherlands