Noise Analysis of an Air-Core Fiber Optic Gyroscope

We report the first measurements of the random walk (RW) of an air-core fiber optic gyroscope (FOG), a novel sensor that exhibits reduced thermal sensitivity thanks to the use of an air-core fiber. Comparing this data to the RW-equivalent noise of the gyro detection system alone and to a simple mode...

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Bibliographic Details
Published in:IEEE photonics technology letters 2007-10, Vol.19 (19), p.1520-1522
Main Authors: Blin, S., Digonnet, M.J.F., Kino, G.S.
Format: Article
Language:English
Subjects:
Backscatter
Backscattering
Detectors
Fiber optic gyroscopes
Gyroscopes
Mathematical models
Noise
Noise measurement
optical fiber interference
Optical fiber sensors
Optical fibers
Optical noise
Optical sensors
Power system modeling
Random walk
Thermal noise
Thermal sensors
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Summary:We report the first measurements of the random walk (RW) of an air-core fiber optic gyroscope (FOG), a novel sensor that exhibits reduced thermal sensitivity thanks to the use of an air-core fiber. Comparing this data to the RW-equivalent noise of the gyro detection system alone and to a simple model of detection noise demonstrates that the measured RW is unaffected by the high backscattering of the air-core fiber, but that it is limited instead by detector thermal noise for detected powers under ~5 muW and source excess noise above ~5 muW. Above this power level, the RW is found to be independent of detected power and equal to 0.021deg/radich, which is comparable to and as low as a conventional FOG with a similar scale factor.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2007.903878