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Heterodyne detection for Fiber Bragg Grating sensors

✍ Scribed by Hedi Bellil; Mustafa A.G Abushagur

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
191 KB
Volume
32
Category
Article
ISSN
0030-3992

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✦ Synopsis

In this paper, we present a Fiber-Bragg-Grating-based temperature sensor. The technique employs heterodyne detection using two Fiber Bragg Gratings. One of the gratings is used as a reference (local oscillator) and the second as a sensing arm. This sensor uses a Folded Mach-Zehnder interferometer. As the temperature changes, the Bragg wavelength of the FBG shifts. The heterodyne detection is used to detect the frequency di erence between the reference and sensing signals that is caused by the temperature change. The dynamic range and sensitivity of the sensor were analyzed and presented.

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