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30 May 1996 In-line coherence multiplexing of displacement sensors: a fiber optic extensometer
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Civil smart structures often require displacement sensors with measurement bases between a few centimeters and a few meters with a precision of the order of 1/100 mm. Low-coherence interferometry offers these performances even for long-term measurements. Being a non- incremental setup, it does not require an uninterrupted monitoring. The main drawback of this technique resides in the fact that a separate sensor is required for each section to be measured. A typical civil structure such as a bridge requires up to 50 sensors for each span, so the complexity for this type of instrumentation and the number of connections often limit its large- scale application. It would be interesting to subdivide the fiber sensor in domains that can be measured separately but have a single lead-out connection. This contribution presents an in- line multiplexing scheme for displacement sensors based on low-coherence interferometry and partial reflectors installed in pairs along the sensing fibers. The multiplexing of up to ten displacement sensors along the same fiber line is demonstrated theoretically and experimentally. Different types of partial reflectors are also compared. The special case of structures that are constructed in sections is also analyzed.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniele Inaudi, Samuel Vurpillot, and Sandra LLoret "In-line coherence multiplexing of displacement sensors: a fiber optic extensometer", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996);


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