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It is a well studied process [1, 2] that energy deposition of cosmic ray particles in water that generate thermo-acoustic signals. Hydrophones of sufficient sensitivity could measure this signal and provide a means of detecting ultra-high energetic cosmic neutrinos. We investigate optical fiber-based hydrophone technology that could potentially have several advantages over conventional hydrophones based on piezo ceramics. Optical fibers offer a natural way to create a distributed sensing system in which several sensors are attached to a single fiber. The detection system in this case would consist of several sensors, an erbium doped fiber and an interferometric interogator. Next to the advantage of having multiple sensors on a single fiber, this technology has a low power consumption, small size and low weight. Maybe even more important, fiber optics technology provides a cost-effective and straightforward way to implement a large number of hydrophones. An investigation has been carried out to study the feasibility of using fiber based hydrophones in an application for cosmic ray particle detection. We find that the hydrophone technology as explained in this paper offers the proper sensitivity as required to detect low signals orginating from the cosmic rays.

Fiber based hydrophones for ultra-high energy neutrino detection