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13 May 2010 Infrared radiation detector using a pair of fiber Bragg gratings
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A novel infrared radiation detector based on a pair of fiber Bragg gratings (FBGs) is described. In the proposed configuration, the two FBGs are distant by a few centimeters and are characterized by Bragg resonances separated by a few nanometers. One FBG of the pair is coated with an IR-absorbing layer which converts the radiation into heat. Therefore, exposure to IR radiations will increase the temperature of the coated FBG, which in turn induces a Bragg wavelength shift to higher values. To take into account the ambient temperature fluctuations, the second grating is protected by an IR-reflecting tube which prevents heating of this grating that can then be used as temperature reference. IR radiation measurements are finally obtained through the monitoring of the differential shift between both Bragg wavelengths. This shift shows a monotonic behavior as a function of the IR radiations. This sensor shows a strong potential for early fire detection as it detects radiation emitted during the fire instead of the temperature increase when the fire is fully developed.
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J.-M. Renoirt, C. Caucheteur, P. Mégret, and M. Debliquy "Infrared radiation detector using a pair of fiber Bragg gratings", Proc. SPIE 7726, Optical Sensing and Detection, 772606 (13 May 2010);

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