Passively mode-locked fiber laser sensor for acoustic pressure sensing |
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Authors: | Shun Wang Hao Liao Liang Zhang Deming Liu Jiangshan Zhang |
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Affiliation: | 1. School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan 430074, China;2. Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract: | The development is reported of a multi-longitudinal mode fiber laser sensor based on passive mode locking employing carbon nanotubes in the laser cavity. A polymer membrane is employed beneath the pre-strained erbium-doped fiber (EDF) to convert the sound pressure disturbance into axial strain, alter the cavity length, and induce a shift of the longitudinal modes beat. Hence, acoustic pressure measurement can be carried out by detecting the shift of the beat frequency. Experimental results show comparable strain and sound pressure sensitivity of ~0.5 kHz/με and 147.2 Hz/Pa, respectively. The proposed sensor is an alternative for the measurement of acoustic pressure and possesses the advantages of good stability and ease of interrogation. |
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Keywords: | fiber laser sensor passive mode locking multi-longitudinal mode acoustic pressure sensor |
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