Experimental verification on effects of flyash on liquefaction resistance buildup and excavatability of the improved soil

Koike, Yohei; Kamiya, Takashi; Fujita, Noriyuki; Konagai, Kazuo

doi:10.3208/jgs.11.179

Cited by 1 publication

(1 citation statement)

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“…The birefringence of a linear polymer is known to be reduced or canceled by optimization of either its molding conditions [1][2][3] or its molecular structure. Known methods for the latter optimization approach include blending, 4,5) copolymerization, [6][7][8][9][10][11][12][13] and/or doping. 8,9,12,14) These techniques are based on the linear molecular structure, in which the birefringence(s) can be expressed as a function of the degree of chain orientation and/or the magnitude of the elastic strain.…”

Section: Introductionmentioning

confidence: 99%

Stress-induced absorption of a birefringence-reduced polymer optical fiber with doped core

Uzawa

Tozaki

Yano

et al. 2019

Jpn. J. Appl. Phys.

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A poly[(methyl methacrylate/2,2,2-trifluoroethyl methacrylate/benzyl methacrylate) = 52/42/6 (w/w/w)] copolymer was used to form the core of a polymer optical fiber (POF) with the purpose of fabricating a birefringence-reduced core (BRC). The fabricated POF showed almost no phase shift, regardless of the stress that was applied to the fiber. Therefore, it is possible to maintain the polarization in the POF core, which is an important factor for detection of the direction in which stress is applied to the POF. To detect the stress direction, the core of a BRC–POF was doped with dichroic dye. A doped BRC–POF that was fabricated using magenta dye showed variations in its output under operating conditions where the stress vector and the incident polarization formed different angular relationships. The results presented here are considered to be applicable to detailed structural monitoring using POFs.

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