Title :
Infrared Radiation Detection With Matched Fiber Bragg Gratings
Author :
Caucheteur, Christophe ; Renoirt, J.M. ; Debliquy, M. ; Mégret, P.
Author_Institution :
Fac. Polytech., Univ. de Mons, Mons, Belgium
Abstract :
In this letter, a novel infrared (IR) radiation detector is proposed for early fire detection. It consists of two matched apodized fiber Bragg gratings (FBGs) cascaded in a single optical fiber and separated by a few centimeters. One of the gratings is covered with an IR-absorbing layer that converts the radiation into heat while the second FBG provides a temperature reference. To obtain a fast and cost-effective detector, the demodulation technique consists in measuring the total reflected power, which monotonically evolves in a range of flux that depends on the FBGs spectral characteristics. With the 24-mm-long Gaussian apodized FBGs used in this work, we report a mean sensitivity of 7 nW/(W/m2) in the range 0-3000 W/m2.
Keywords :
Bragg gratings; Gaussian processes; demodulation; fibre optic sensors; infrared detectors; photodetectors; spectral analysis; temperature measurement; Gaussian apodized FBG; IR detector; IR-absorbing layer; demodulation technique; infrared radiation detector; matched fiber Bragg gratings; size 24 mm; spectral properties; total reflected power; Detectors; Fiber gratings; Optical fiber sensors; Optical fibers; Temperature measurement; Temperature sensors; Fiber Bragg gratings (FBGs); infrared (IR) radiation; sensor; temperature;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2083643
