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26 May 2011Towards development of a fiber optic-based transmission
monitoring system
There is interest in the rotorcraft community to develop health monitoring technologies. Among these technologies is
the ability to monitor the transmission planetary gear system. The gearbox environment does not lend itself to traditional
sensing technologies due to the harsh environment and crowed space. Traditional vibration-based diagnostics are based
on the output from externally mounted sensors, usually accelerometers fixed to the gearbox exterior. This type of system
relies on the ability of the vibration signal to travel from the gears through the gearbox housing. These sensors are also
susceptible to other interference including electrical magnetic interference (EMI). For these reasons, the development of
a fiber optic-based transmission monitoring system represents an appealing alternative to the accelerometer due to their
resistance to EMI and other signal corrupting influences. Aither Engineering has been working on integrating the fiber
optic sensors into the gearbox environment to measure strain on the ring gear of the planetary gear system. This
application utilizes a serial array of wavelength division multiplexed fiber Bragg grating (FBG) sensors. Work in this
area has been conducted at both the University of Maryland, College Park and more recently at the NASA Glenn
Research Center (NGRC) OH-58 transmission test rig facility. This paper discusses some of the testing results collected
from the fiber optic ring gear sensor array. Based on these results, recommendations for system requirements are
addressed in terms of the capabilities of the FBG instrumentation.
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Chris S. Baldwin, Jason S. Kiddy, Paul D Samuel, "Towards development of a fiber optic-based transmission monitoring system," Proc. SPIE 8026, Photonic Applications for Aerospace, Transportation, and Harsh Environment II, 80260N (26 May 2011); https://doi.org/10.1117/12.887070