Fully optical reelable hydrophone streamers and arrays
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Do you have a need to measure acoustics subsea? And did you investigate in existing hydrophone solutions, however 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 fiberglass that operates with high sensitivity @sea state zero behind any surface or underwater platform.

Highly sensitive, small diameter, hundreds of sensors in on 1 array and low weight.

Connecting several sensors in an array is possible by using 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.