Robust optical fiber bending sensor to measure frequency of vibration

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• 作者：Arturo Ignacio Hern&aacute ; ndez-Serrano ; Guillermo Salceda-Delgado ; David Moreno-Hern&aacute ; ndez ; Alejandro Martí ; nez-Rí ; os ; David Monzó ; n-Hern&aacute ; ndez ; ^dmh@cio.mx ; ^{dmonzon@cio.mx} ; ^amr6@cio.mx
• 关键词：Fiber interferometer ; Tapered fiber ; Vibration sensors
• 刊名：Optics and Lasers in Engineering
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：51
• 期：9
• 页码：1102-1105
• 全文大小：383 K

文摘

A simple technique for sensing the acoustic vibration of a cantilever beam, using a single-fiber Mach-Zehnder interferometer, is presented. The interferometer consists of two concatenated low-loss fused fiber tapers, with a waist diameter of 60 ¦Ìm, separated by an un-tapered fiber section of 10 mm length. The interferometer transmitted signal is modulated when the device is bent under the presence of an external acoustic signal. The optical fiber device glued directly on a metallic cantilever beam is capable of measuring frequency of the resonant modes. The interrogation set-up is simple consisting of a single tunable diode laser and a photodetector. The measured frequencies of the resonating modes agree with the numerical results obtained by the Finite Element Method.