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Flextensional Transducer

September 21, 2021


A Flextensional Transducer (FT) consists of an internal element that directly drives the outer shell.

Flextensional Transducers are categorised into classes based on their design pattern. At Neptune Sonar, we have focused on the Class IV design combining a conventional piezoelectric drive stack and a convex metal outer shell. 

As the stack expands along the length, the sides are drawn in towards the centre. The ceramic then begins to shrink, pulling the ends of the shell back in with it, forcing the sides out. The shape of the device, coupled with this inverse motion allows for a low frequency response in a much smaller footprint.

Designed to operate between 1 & 2 kHz, the T473 is a class IV Flextensional transducer developed by Neptune Sonar, for shallow depths (up to 50m). It has the capacity to transmit up to 1.5 kVrms, making it a perfect choice for low frequency, high power and long range transmissions. Despite its shape, The T473 has an omni-directional operation, showing little change around the axes(2dB horizontally and 3dB vertically).

To find out more about the T473 take a closer look or get in touch.


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Our Company

Formed in 1990, Neptune Sonar is now the leading company in underwater transducer technology, offering one of the world's largest and most comprehensive range of undersea defence and commercial transducers.

Based in the UK, our research and manufacturing operation is located on a 25-acre site in East Yorkshire. With a 60,000 square metre trials lake and a floating calibration laboratory, the site provides an extensive range of facilities supporting every aspect of acoustic transducer development from modelling and design to final product acceptance.

We also provide PZT components from our Zeus Piezoceramics facility in Hessle, East Yorkshire.

Neptune Sonar Limited
Kelk Lake
East Yorkshire
YO25 8HG

T: 01262 490234
E: sales@neptune-sonar.co.uk
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We design, manufacture and test acoustic sensors and electronics for...

  • Naval Defense
  • Maritime Security
  • Offshore Oil & Gas
  • Hydrographic Survey Industry
  • Oceanographic Science
  • Environmental Sectors
  • Aquaculture