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2 February 2009 Design and test of multimode interference based optical fiber temperature sensors
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Fiber-optic temperature sensors offer unique advantages, such as immunity to electromagnetic interferences, stability, repeatability, durability against harsh environments, high sensitivity and resolution, and fast response. Therefore, optical fiber sensors have been widely adopted and applied in various areas for temperature measurements. It has been demonstrated that by using multimode interferences in a segment of multimode fiber, wavelength-encoded fiber optic temperature sensing can be achieved. The advantages of this kind of temperature sensors include the extremely simple structure and the ability for high-temperature measurements. In this work, we investigate the interference of core mode and cladding modes in double cladding fibers. Analysis and simulations are carried out in order to identify the optimal parameters of the temperature sensor. Practical design of the multimode interference based optical fiber temperature sensors is investigated, and sensing probes are fabricated and tested. The design details, temperature measurement experiments, and test results are presented in this paper.
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Enbang Li "Design and test of multimode interference based optical fiber temperature sensors", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71570F (2 February 2009);

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