Recent incidences of sabotage of Oil and Gas pipelines in the Baltic Sea have made it clear that sub-sea pipelines are vulnerable and will require surveillance for protection. Harbors and ports are noisy. Pressure measurements from hydrophones allow only measurements of signal arrival times. With only this information, a dense, spatially dispersed sensor array is required for detection and localization. Using vector sensors allow additional estimation of direction of propagation at each measurement point, allowing separating signals from multiple sources. A smaller number of vector sensors can replace a larger number of scalar pressure sensors. Static sea-floor deployment of the sensor array, allows accurate mapping after deployment, reducing inaccuracies in sensor locations found in mobile systems. We describe a method that allows using multi-component sea-floor sensors to identify and track any source of acoustic energy even when the orientations of the multi-component sensors are unknown. Sources that satisfy certain simple assumptions can be used to find the absolute orientation of the multi-component sensors. The methodology allows using a simplified sensor array where a short-interval fiber-optic DAS array is combined with a sparse array of two-component, transverse-only, point sensors. We describe optical multi-component accelerometers, that are easily combinable with DAS sensor arrays. Without electronics, there is no need for power - and the risk of failure of electronics left for a long period of time is eliminated, significantly increasing the lifetime of the installation. The acquisition system for the hybrid optical array will be simpler and enable “always-on” monitoring.
Fast-light phenomena can enhance the sensitivity of an optical gyroscope of a given size by several orders of magnitude, and could be applied to other optical sensors as well. MagiQ Technologies has been developing a compact fiber-based fast light Inertial Measurement Unit (IMU) using Stimulated Brillouin Scattering in optical fibers. We will report on our findings, including repeatable fast-light effects in the lab, numerical analysis of noise and stability given realistic optical specs, and methods for optimizing efficiency, size, and reliability with current technologies. The technology could benefit inertial navigation units, gyrocompasses, and stabilization platforms, and could allow high grade IMUs in spacecraft, unmanned aerial vehicles or sensors, where the current size and weight of precision gyros are prohibitive. By using commercially mature technologies, we believe that our design is appropriate for development without further advances in materials or components.
Fast-light phenomena can enhance the sensitivity of an optical gyroscope of a given size by several orders of magnitude, and could be applied to other optical sensors as well. MagiQ Technologies has been developing a compact fiber-based fast light Inertial Measurement Unit (IMU) using Stimulated Brillouin Scattering in optical fibers with commercially mature technologies. We will report on our findings, including repeatable fast-light effects in the lab, numerical analysis of noise and stability given realistic optical specs, and methods for optimizing efficiency, size, and reliability with current technologies. The technology could benefit inertial navigation units, gyrocompasses, and stabilization techniques, and could allow high grade IMUs in spacecraft, unmanned aerial vehicles or sensors, where the current size and weight of precision gyros are prohibitive. By using photonic integrated circuits and telecom-grade components along with specialty fibers, we also believe that our design is appropriate for development without further advances in the state of the art of components.
It has been proposed that fast-light optical phenomena can increase the sensitivity of an optical gyroscope of a given size
by several orders of magnitude. MagiQ Technologies is developing a compact fiber-based fast light Inertial
Measurement Unit (IMU) using Stimulated Brillouin Scattering (SBS) in optical fibers with commercially mature
technologies. We have demonstrated repeatable fast-light effects in the lab using off-the shelf optical components.
Numerical analysis has revealed the requirements for stable, sensitive operation of gyroscopes, accelerometers or other
sensors, as well as identified methods for optimizing efficiency, size, and reliability with known optical technologies. By
using photonic integrated circuits and telecom-grade components along with specialty fibers, our design would be
appropriate for mass production. We have eliminated all free-space optical elements or wavelength dependent elements
such as atomic vapor cells in order to enable a compact, high sensitivity IMU stable against environmental disturbances.
Results of this effort will have benefits in existing applications of IMUs (such as inertial navigation units,
gyrocompasses, and stabilization techniques), and will allow wider use of RLGs in spacecraft, unmanned aerial vehicles
or sensors, where the current size and weight of optical IMUs are prohibitive.
It has been proposed that fast-light optical phenomena can increase the sensitivity of a Ring Laser Gyroscope (RLG) of a given size by several orders of magnitude. MagiQ is developing a compact fully-fibered fast light RLG using Stimulated Brillouin Scattering (SBS) in commercial optical fiber. We will discuss our experimental results on SBS pumped lasing in commercial fibers and analyze their implications to the fast light generation. Based on these results, we envision a fast light enhanced Ring Laser Gyroscope (RLG) that will use only a few meters of fiber and require moderate pump power (only a few 100’s of mW). We will present the design that is based on proven, commercially available technologies. By using photonic integrated circuits and telecom-grade fiber components, we created a design that is appropriate for mass production in the near term. We eliminated all free-space optical elements (such as atomic vapor cells), in order to enable a compact, high sensitivity RLG stable against environmental disturbances. Results of this effort will have benefits in existing applications of RLGs (such as inertial navigation units, gyrocompasses, and stabilization techniques), and will allow wider use of RLGs in spacecraft, unmanned aerial vehicles or sensors, where the current size and weight of optical gyros are prohibitive.
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