Plamen Balzhiev, W. Bock, P. Mikulic, T. Eftimov, R. Arnaudov, V. Plachkova
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Multiplexed LPG sensor system using an InGaAs CCD linear array and optical switches
In this paper we report our progress on the development of a spatially and spectrally multiplexed LPG-based fiber-optic sensor that uses an InGaAs CCD linear array and a diffraction grating for the detection of spectral changes. Three 1×2 fiber-optical switches are used to realize a system of spatial multiplexing of four sensing channels. Up to three LPGs can be connected in series in each channel covering a spectral range from 1525 nm to 1610 nm. The gratings are interrogated in a reflective mode using a tunable fiber reflector and a circulator. The system's performance was tested using bending and mechanical deformations on the gratings.
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