Depth Insensitive Pressure/Vector Sensor Arrays

There is a critical DoD need for reliable acoustic vector sensor arrays with high signal dynamic range, low self-noise, and are capable of operating effectively across all ocean depths to detect, classify and localize low-level signals. Deployment below the critical depth allows the vertical line of vector sensors to exploit the Reliable Acoustic Path (RAP), and enables monitoring a large volume of water. Noise sources outside the (RAP) volume are strongly attenuated by reflection, absorption, and scattering, so the dominant signals arriving at the sensors are from within the RAP area. VIP Sensors proposes todevelop a low cost, size, weight and powerDepthInsensitive Optical Vector Sensor Array(DIOSA) System that can be deployed in A-sized sonobuoys and operate inwide range of ocean environments, especially in deep (> 6 kilometers). The DIOSA System consist of multiple underwater vector sensors interconnected by a fiber optic cable to an interrogation electronic module.The fully passive vector sensors include three orthogonally mounted accelerometers and an omnidirectional hydrophone. The triaxial accelerometers measured the detection of sound and the hydrophone provides its amplitude. The vector sensors are extrinsic Fabry-Perot fiber optic MOMS (Micro Optical Mechanical system) silicon chips.