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REMOTE INTERFEROMETRIC DISPLACEMENT MEASUREMENT VIA POLARIZATION MAINTAINING FIBERS

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Abstract

A typical thermal expansion coefficient of optical fibers ranges from 10 to 100 μm/m°C. This fact makes it very difficult to use optical fibers for precise interferometric measurement. A newly developed interferometer system, adopting a dual Mach–Zehnder configuration with polarization maintaining fibers, made it possible to measure the displacement in the severe electromagnetic noise environment of the nuclear fusion research plant. The transmission of optical signals between the interferometric optics and remotely located electronics are made through optical fibers, to avoid electro-magnetic interference. The dual Mach-Zehnder interferometer compensates the fiber induced fluctuaion to assure the high resolution measurement of sub-microns. In this study, practical application of the polarization maintaining fiber is also confirmed to be possible.

© 1986 Optical Society of America

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