A new approach to refractive index sensing for biological solutions has been investigated for a web-based monitoring
system. The system was implemented such that the refractive index was monitored by an LPG-FBG hybrid sensor. The
point was how the enhanced sensitivity range of LPG could be used. For the purpose, equations were newly derived,
based on a nonlinear relationship between values of the refractive index and the resonant wavelength. The values
calculated by the equations were in good agreement with experimental values monitored by the system, enabling the
system to use the enhanced sensitivity range.
A multi long-period grating (multi-LPG) sensor has been proposed for distributed sensing. To fabricate the
multi-LPG sensor, a carved LPG has also been proposed for easy fabrication of the multi-LPGs with different resonant
wavelengths in a similar loss spectrum. The 2-LPG sensor was fabricated in a fiber successfully, containing carved and
uncarved LPGs. The resonant wavelength shift was 64 nm by the carving. The temperature dependence of the resonant
wavelength was 0.11 nm/deg, and the temperature distributed sensing was demonstrated to be possible by the 2-LPG
sensor.
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