A passive hydrophone for high-frequency application

Passive, fiber-optics-based hydrophones are already used for marine acoustic positioning systems, oceanographic and geophysics research, as well as for military application. An existing concept has been optimized in order to increase device frequency bandwidth and operating depth, thus making the device attractive for new fields of application. A full-detailed design has been done and a prototype assembled to have an overview of all manufacturing issues. That hydrophone will be submitted to a full qualification test campaign, to validate the design approach in view of further optimization.