@inproceedings{82e34a0ef73142d3a7654ea26874479f,
title = "Compact and fast interrogation unit for fiber Bragg grating sensors",
abstract = "We present a compact and fast wavelength monitor capable of resolving pm wavelength changes. A photosensor array or position detector element is coated with a linear variable filter, which converts the wavelength information of the incident light into a spatial intensity distribution on the detector. Differential read-out of two adjacent elements of the photosensor array or the position detector is used to determine the centroid of this distribution. A wavelength change of the incident light is detected as a shift of the centroid of the distribution. The performance of this wavelength detector was tested with a wavelength tunable light source. We have demonstrated that our device is capable of detecting wavelength changes as small as \textasciitilde{}0.1 pm. The wavelength monitor can be used as read-out unit for any optical sensor that produces a wavelength shift in response to a stimulus. In particular, changes in the reflection properties of one and two-dimensional photonic crystals can been detected. The performance of this interrogation method has been tested for the case of temperature and strain sensors based on Fiber Bragg Gratings (FBG",
keywords = "optical sensor, interrogation, read out, vibration sensor, FBG sensor",
author = "Peter Kiesel and Markus Beck and Oliver Schmidt and Noble Johnson and Michael Bassler and Wolfgang Ecke and Kerstin Schroeder and Hartmut Bartelt",
year = "2007",
doi = "10.1117/12.734869",
language = "English",
isbn = "978-0-8194-6918-2",
volume = "6758",
series = "Proceedings of SPIE",
booktitle = "Proceedings, Photonics in the Transportation Industry; Auto to Aerospace",
note = "Optics East 2007 : Photonics in the Transportation Industry: Auto to Aerospace ; Conference date: 09-09-2007 Through 12-09-2007",
}