4 October 1994 Lightning testing of a linear optical position transducer
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An advantage to using a Fly-By-Light system with fiberoptic transducers and interconnects is immunity to disrupts and/or failure due to lightning strikes. The most vulnerable area of any flight control system on a helicopter is the swashplate region, where linear optical position transducers (LOPTs) would measure mean rotor actuator ram position. On the RAH-66 Comanche helicopter, LOPTs would be mounted inside the cylinders of these rams, providing protection from a direct lightning attachment to the ram. Lightning survivability testing was conducted at the Boeing Developmental Center's Lightning Facility the week of December 14 - 18, 1992. A time-division multiplexed LOPT was tested in a protected, aircraft-similar installation as well as unprotected. Transducer data during the strikes were compared to the results of similar tests performed on a linear variable differential transformer.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jon Lundberg, "Lightning testing of a linear optical position transducer", Proc. SPIE 2295, Fly-by-Light, (4 October 1994); doi: 10.1117/12.188841; https://doi.org/10.1117/12.188841

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