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From High Technology to Solutions: The Experience of iXSea |
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Fiber Optic Gyroscope (FOG) is an elegant application of a fascinating phenomenon, the Sagnac Effect. It uses optical waves propagating in a fiber optic coil to measure a rotation rate accurately.
Its design, which seems very simple, takes full advantage of the Reciprocity Principle on the propagation of light.
This fundamental principle allows “a perfect device to be created from imperfect components!”
At IXSEA, our FOGs are the result of more than 15 years research and engineering, and can address the most demanding applications and performance - from 0.1°/h up to 0.001°/h. |
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Gyroscope(From Wikipedia, the free encyclopedia) |
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A gyroscope is a device for measuring or maintaining orientation, based on the principles of angular momentum[1][2]. The device is a spinning wheel or disk whose axle is free to take any orientation. This orientation changes much less in response to a given external torque than it would without the large angular momentum associated with the gyroscope's high rate of spin. Since external torque is minimized by mounting the device in gimbals, its orientation remains nearly fixed, regardless of any motion of the platform on which it is mounted. |
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Ring laser gyroscope |
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A ring laser gyroscope (RLG) uses interference of laser light within a optical ring to detect changes in orientation and spin. It is an example of a Sagnac interferometer.
The first experimental ring laser gyroscope was demonstrated in the US by Macek and Davis in 1963. The technology has since been developed by a number of companies and establishments world-wide. Many tens of thousands of RLGs are operating in inertial navigation systems and have established high accuracy, with better than 0.01°/hour bias uncertainty, and mean time between failures in excess of 60,000 hours. |
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Fibre optic gyroscope |
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A fibre optic gyroscope (FOG) is a gyroscope that uses the interference of light to detect mechanical rotation. The sensor is a coil of as much as 5 km of optical fiber. Two light beams travel along the fiber in opposite directions. Due to the Sagnac effect, the beam traveling against the rotation experiences a slightly shorter path than the other beam. The resulting phase shift affects how the beams interfere with each other when they are combined. The intensity of the combined beam then depends on the rotation rate of the device. |
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Inertial navigation system |
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An Inertial Navigation System (INS) is a navigation aid that uses a computer and motion sensors to continuously track the position, orientation, and velocity (direction and speed of movement) of a vehicle without the need for external references. Other terms used to refer to inertial navigation systems or closely related devices include inertial guidance system, inertial reference platform, and many other variations. |
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A history of inertial navigation systems(pdf) |
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Overview of inertial instrument types(pdf) |
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An introduction to inertial navigation(pdf) |
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