Abstract
We have developed a new distributed strain measurement system with a long gauge Fiber Bragg Grating (FBG) sensor based on Optical Frequency Domain Reflectometry (OFDR). This sensing system enables us to measure strain at an arbitrary position along the FBG sensor with a high spatial resolution below 1mm. However, the sensing range of this system is confined to 〜10m at present. To expand the measurement range, we have problems in several components of the measurement system, such as the signal processing capability, limitation of measurable range due to reflection properties of the FBG sensor, and the effect of length fluctuation in the arm length of the interferometer. This paper discusses these factors using a simulation model of based on coupled mode theory. The signal analysis time was shortened by confining the analyzing section. The simulated result showed that, the measurable range is approximately 1.5m, and the length fluctuation in the arm length of measurement interferometer has a significant effect on the measured result.
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