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《Chinese Journal of Luminescence》 2015-03
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Sensing Mechanism of Fiber Cladding Mode Frustrated Total Internal Reflection and Design of The Liquid Level Probe

HOU Yu-long;ZHANG Hui-xin;ZHEN Cheng-fang;SU Shan;LIU Jia;LIU Wen-yi;LIU Jun;XIONG Ji-jun;Key Laboratory of Instrumentation Science & Dynamic Measurement,Ministry of Education,North University of China;National Key Laboratory for Electronic Measurement Technology,North University of China;Science and Technology on Inertial Laboratory,Beihang University;Precision Opto-mechatronics Technology Key Laboratory of Education Ministry,Beihang University;  
The cladding mode frustrated total internal reflection( CMFTIR) effect and its sensing mechanism were analyzed and demonstrated. The method of acquiring remarkable CMFTIR effect was proposed. This method uses the distortion of fiber mode field caused by macro-bending to excite cladding mode. By using this method,the CMFTIR effect could be enhanced remarkably and be used for liquid level detection. The experiment shows that CMFTIR effect is relatively weak and easy to be submerged by strong background noises. In order to solve this problem,the method of improving signal-to-noise ratio was proposed by using macro-bend coupling and dark-field signal. Then,the twisted macro-bend coupling liquid level probe and its encapsulation structure were designed.The experiment results show that dark-field signal has obvious advantage on signal-to-noise ratio,and the sensor realizes extinction ratio above 3. 7 d B. Compared with the same kind of probes,the sensor is robust,low-cost and easy to manufacture.
【Fund】: 国家自然科学基金(51275491 61275166)资助项目
【CateGory Index】: TP212
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