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Fiber Optic Gyroscope Sensors
Published in Shizhuo Yin, Paul B. Ruffin, Francis T. S. Yu, Fiber Optic Sensors, 2017
The advent of the fiber optic gyroscope (FOG) dates back to the mid-1970s when Vali and Shorthill [1] demonstrated the first fiber optic rotation sensor. This breakthrough followed the pioneering efforts of R. B. Brown from the Navy Laboratory in 1968, who proposed a coil of optical fiber as a rotation sensor. Fringes were demonstrated in an optical fiber ring interferometer in 1975 using low-loss, single mode fiber. During the years to follow, a number of researchers and developers worldwide made the FOG concept become a reality [2–5]. A number of universities and industrial laboratories such as McDonnell Douglas, Northrop-Grumman (Litton), Honeywell, Northrop, Singer, Lear Siegler, Martin Marietta, and others have investigated the FOG. Gyroscope bias errors of 0.01°/hr were being achieved in the laboratory by the early 1980s. Although the theoretical basis for FOG operation is published worldwide, the details of the design techniques and processes are not published in open literature due to proprietary restrictions.
Mass data methods
Published in W. Schofield, M. Breach, Engineering Surveying, 2007
Fibre optic gyroscopes (FOG) use the same principle but instead of using a simple square or triangular path, the light is carried in a fibre optic coil of many turns. The main problem with this approach is strain distribution in the optical fibre caused by temperature changes and accelerations of the platform. See Figure 14.53.
A 2.71 fJ/conversion-step 10-bit 50 MSPS split-capacitor array SAR ADC for FOG systems
Published in International Journal of Electronics, 2022
Chua-Chin Wang, Ralph Gerard B. Sangalang, Meng-Jie Wu, Tzung-Je Lee, Yi-Jen Chiu, Lean Karlo S. Tolentino, Oliver Lexter July A. Jose
A fibre optic gyroscope system makes use of optical fibre to measure angular movement based upon the process called the Sagnac Effect. When the gyro makes a rotation, the optical signal passing through the fibre optic cable experiences phase shift sensed by a photo detector. This then goes through digital conversion for further processing to get the rotational angle as depicted in Figure 1. The required sampling rate for a system with 0.5/hr specification is 50 MS/s at 10 bits resolution for military applications.