SONAR Beacons

Sonar Beacon transducers are an integral part of the Sonar Beacon Systems (SBS) in submarines. In the event of an accident or incident, the SBS is activated as an emergency pinger to precisely locate the submarine by the rescue ships. The SBS transducers developed by ENS Piezodevices Ltd. are based on the reliable Tonpilz design and operate at 9 kHz (LF) and 37.5 kHz (HF).


A thin-walled hollow sphere transducer structure redistributes the stress and effectively amplifies incoming stress like a flextensional transducer, by a ratio of radius/thickness (r/t) of the sphere to provide large hydrostatic piezoelectric charge coefficients. It provides an omnidirectional electroacoustic response. ENS Piezodevices Ltd. uses two different methods to fabricate spherical omnidirectional transducers operating in a wide frequency range from 20 kHz to 1 MHz.


Pinger transducers are mainly used in manned and unmanned underwater vehicles, either as projectors to actively search and locate targets, or provide active ultrasound signals for tracking purposes. Depending on the specific demands of the application, the pingers developed by ENS Piezoedevices Ltd. can operate in a wide frequency range from 20 kHz to 80 kHz. They can either generate highly directional acoustic signals or may provide in-plane omnidirectional transmitting response.

Tonpilz Arrays

Arrays of transducers are used in applications requiring beam forming or active/passive scanning. Transducers based on the Tonpilz design have been developed by ENS Piezodevices Ltd. for projector arrays operating different frequencies on demand.


Bulk piezoelectric ceramics have poor electracoustic performance due to high acoustic impedance. Applications such as side-scan sonar, active vibration control and energy harvesting also require flexible piezoelectric transducers. The main solution proposed for these problems is the piezocomposite design where piezoelectric fibers or particles are embedded in a passive polymer matrix. ENS Piezodevices Ltd. have expertise in fabrication of 1-3 and 0-3 piezocomposites .