30 March 2012 An iterative search method for strain measurement in EFPI sensors
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In this paper, a new method is given for estimating strain in extrinsic, Fabry-Perot, interferometric (EFPI) fiber-optic sensors under sinusoidal excitation at the sensor. The algorithm has a low complexity and is appropriate for low-cost applications. It is an iterative search algorithm based upon a known, sinusoidal excitation and a mean-square-error objective function. The algorithm provides an estimate of the maximum time-varying strain due to the excitation. It is shown that, for a broad range of parameters, the algorithm converges to the global minima with a high degree of probability. Empirical test results for two fiber-optic sensors with different gauge lengths along with corresponding measurements from a resistive strain gauge are given and shown to compare very well.
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W. J. Ebel, K. K. Mitchell, "An iterative search method for strain measurement in EFPI sensors", Proc. SPIE 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012, 83460R (30 March 2012); doi: 10.1117/12.917311; https://doi.org/10.1117/12.917311

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