Effects of hydrogen loading conditions on fabrication of long-period fiber-grating sensors by low-pressure mercury lamp

Toru Mizunami; Yoshihisa Tashiro

doi:10.1117/12.2070925

6 January 2015 Effects of hydrogen loading conditions on fabrication of long-period fiber-grating sensors by low-pressure mercury lamp

Toru Mizunami, Yoshihisa Tashiro

Author Affiliations +

Proceedings Volume 9450, Photonics, Devices, and Systems VI; 94500I (2015) https://doi.org/10.1117/12.2070925
Event: Photonics Prague 2014, 2014, Prague, Czech Republic

Abstract

Conditions of hydrogen loading were studied for shortening of the exposure time for fabrication of long-period fiber grating sensors using a low-pressure mercury lamp. By an increased hydrogen pressure of 135 atm, shortening of the exposure time to 2/3 that of 120 atm was obtained. By increasing the loading time from 4 to 12 weeks, the exposure time was shortened to 3/4 that of the same pressure, or half that of 120 atm for 3 weeks. The temperature rise of the fiber during exposure was measured to be 16 °C or less. Distribution of hydrogen molecules in the fiber was studied by a numerical analysis solving a diffusion equation. The result of the analysis agreed with the pressure dependence of the measured hydrogen concentration and the exposure time for fabrication. For the longer loading time, neither the calculated nor the measured hydrogen concentrations increased: the shortening of the exposure time by the longer loading time was not explained. The temperature and strain sensitivities were lower than those of hydrogen loading at 120 atm except that a temperature sensitive and strain insensitive long-period grating was obtained with a period of 460 μm.

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Toru Mizunami and Yoshihisa Tashiro "Effects of hydrogen loading conditions on fabrication of long-period fiber-grating sensors by low-pressure mercury lamp", Proc. SPIE 9450, Photonics, Devices, and Systems VI, 94500I (6 January 2015); https://doi.org/10.1117/12.2070925

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KEYWORDS

Hydrogen

Lamps

Temperature metrology

Mercury

Fiber optics sensors

Sensors

Optical fibers

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