Fully optical reelable hydrophone streamers and arrays
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Do you have a need to measure acoustics subsea? And did you investigate existing hydrophone solutions, and encountered challenges due to sensitivity, physical size, weight, power usage, maximum amount of sensing elements and/or complicated (costly) designs?

Optics11 offers a fully optical towed array that deals with these challenges. The array consists of miniaturized mandrels wrapped with glass fiber that operates with high sensitivity @sea state zero behind any surface or underwater platform. The sensors are highly sensitive and have a small diameter. These characteristics make it possible to create one array with hundreds of sensors and be of low weight. 

Connecting several sensors in an array is also possible because of our unique patented readout technology.

Key features

10 Hz - 500 Khz measuring


extreme sensitive

fully passive compensated


Small diameter, reelable

Accurate, pre-calibrated and easy to use

No maintenance required


ZonaSens is based on optical fiber interferometry and offers a completely new sensor configuration.  Multiple zones in one optical fiber, with lengths of centimeters to meters, can be defined to become extremely sensitive to strain. The beginning and end of a sensing zone are each defined by a Fiber Bragg Grating. To create an interferometry signal between two gratings, a combination of Michelson interferometers is used. A Michelson interferometer uses a single reflection on the transducer side that interferes with a reflection in a reference path. Two linearized interferometers form each sensing zone, resulting in a very high sensitivity and a measurement speed of up to 1 million samples per second. Between the gratings, the sensitive zone can be wrapped around a mandrel to make an acoustic point transducer. The sensitivity is at the femto-strain level, making direct measurement of acoustic vibrations possible. This sensitivity allows for a very small transducer design. Optics11 has a core technology patent for ZonaSens technology.