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14 February 2005 A novel spatial-frequency-multiplexed fiber-optic Fizeau strain sensor system
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A novel method for multiplexing fiber-optic Fizeau strain sensors with optical amplification is proposed and demonstrated. This method overcomes the two intrinsic disadvantages of fiber-optic Fabry-Perot (F-P) strain sensors, i.e. weak signal and difficult multiplexing. The amplified spontaneous emission (ASE) and optical amplification of an Erbium-doped fiber (EDF) pumped by a 980nm laser diode are used simultaneously to enhance the interferometric signal considerably. A Fizeau interferometer formed by two fiber ends with a quite different reflectivity is used to replace the F-P cavity in sensor head design. Such a Fizeau cavity can enlarge the cavity length by at least an order of magnitude and allows more than ten sensors to be multiplexed simultaneously by using spatial-frequency multiplexing. The operating principle of the sensor system is discussed and an experiment is carried out to verify the concept of the method proposed. It is anticipated that such a sensor system could find important applications for health monitoring of large structures.
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Yun-Jiang Rao, Jian Jiang, and Chang Xue Zhou "A novel spatial-frequency-multiplexed fiber-optic Fizeau strain sensor system", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005);

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