All-fiber optic acoustic sensor based on multimode-single mode-multimode structure |
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| Authors: | An Sun Zhishen Wu Chunfeng Wan Caiqian Yang |
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| Institution: | 1. Department of Urban and Civil Engineering, Ibaraki University, Hitachi 316-8511, Japan;2. College of Civil Engineering, Northeast University, Nanjing 210096, Jiang Su, China |
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| Abstract: | A simple and low cost optical fiber acoustic sensor based on multimode-single mode-multimode (MSM) fiber structure is presented. The optical coupling efficiency between hetero-core fibers spliced structure is modulated by acoustic pressure through a thin metal foil. Acoustic wave is detected by measuring the intensity change of transmission light. Experiments are carried on to testify the performance of MSM fiber acoustic sensor and the experimental results show that the acoustic wave can be sensitively detected within 11 kHz frequency range. |
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