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Interrogation of a Dual-Fiber-Bragg-Grating Sensor Using an Arrayed Waveguide Grating

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3 Author(s)
Robertson, D. ; Strathclyde Univ., Glasgow ; Niewczas, P. ; Mcdonald, James R

In this paper, we consider the possibility of improving the accuracy of a solid-state fiber Bragg grating (FBG) interrogation system by using two, instead of one, FBGs inscribed on the same location of the fiber, with a small difference in the peak wavelength that each reflects. Signal processing can be applied to the outputs of the photodetectors that are connected to an arrayed waveguide grating to provide a linear response from the sensor. We demonstrate here that this method reduces errors when compared to the setup employing a single FBG with the same bandwidth as the dual sensor.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:56 ,  Issue: 6 )