Abstract
We demonstrate a novel technique for the interrogation of grating-based
fiber optic sensors. The proposed technique is based on space-to-wavelength
mapping using an arrayed waveguide grating (AWG). The beam position along
the AWG input coupler is controlled by a closed-loop piezoelectric motor. By
employing a real-time position feedback encoder, the absolute position of
the input light beam can be accurately obtained, which would yield a precise
interrogation of the wavelength due to a fixed relationship between the beam
position and the transmission wavelength of the AWG channel. The proposed
system for the interrogation of fiber Bragg grating (FBG) sensors and a
tilted-FBG sensor is experimented. An interrogation resolution of 3 pm and
an interrogation range of 18 nm are demonstrated as well as the multichannel
measurement capability. Initial results show that the proposed interrogation
system has the potential of being packaged into a compact, light weight, and
cost-effective interrogator with good performance.
© 2010 IEEE
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