An iterative search method for strain measurement in EFPI sensors

W. J. Ebel; K. K. Mitchell

doi:10.1117/12.917311

30 March 2012 An iterative search method for strain measurement in EFPI sensors

W. J. Ebel, K. K. Mitchell

Proceedings Volume 8346, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2012; 83460R (2012) https://doi.org/10.1117/12.917311
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

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.

Citation Download Citation

W. J. Ebel and 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); https://doi.org/10.1117/12.917311

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