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2 June 2011 Chiral fiber sensors for harsh environments
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We have fabricated chiral fiber long-period gratings (CLPGs) for radiation sensing by co-twisting two standard optical fibers or twisting a single custom optical fibers with nonconcentric core as the fibers pass though a miniature oven. The wavelength shift of transmission dips in the CLPGs have proven to be much more sensitive to ionizing radiation than are fiber Bragg gratings. The radiation sensitivity of these CLPGs was investigated in a wide variety of twisted fibers at the Fraunhofer Institute for Technological Trend Analysis by Henschel et al.7. Because chiral fiber gratings do not rely on glass photosensitivity, as is the case for fiber Bragg gratings (FBGs), chiral radiation sensors can be fabricated from a range of glass combinations selected strictly for their sensitivities to radiation in different circumstances. The fiber may also be made of glass selected to be radiation insensitive so that the fiber can be used to sense temperature in high-radiation environments. Radiation-induced shifts of up to 10 nm are observed in transmission dips of CLPGs for doses of 100 kGy of Co-60 gamma radiation. With such high sensitivity, these gratings can be used as radiation sensors for doses below 10 Gy. The wavelength shift was found to depend upon the radiation dose rate. This dependence is found to vary with glass composition. This opens up the possibility of using two CLPGs to simultaneously measure both the dose and rate of radiation.
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Victor I. Kopp, Jonathan Singer, Daniel Neugroschl, and Azriel Z. Genack "Chiral fiber sensors for harsh environments", Proc. SPIE 8028, Fiber Optic Sensors and Applications VIII, 802803 (2 June 2011);

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