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http://dx.doi.org/10.5050/KSNVE.2012.22.7.626

Sound Pressure Sensitivity Variation of the Hollow Cylinder Type Sagnac Fiber Optic Sensor According to the Mandrel Install Direction and Its Material  

Lee, Jong-Kil (안동대학교 기계교육과)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.22, no.7, 2012 , pp. 626-633 More about this Journal
Abstract
In this paper, sound pressure sensitivity of the fiber optic acoustic sensor according to sensor direction and mandrel material were investigated experimentally. Three different directions were selected as stand, lay, and hole. Hollow cylinder type mandrel dimension is 30 mm in outer diameter, 45 mm in length, and 2 mm in thickness, and about 50 m optical fibers were wounded on the surface of the mandrel. Non-directional sound speaker was used as a sound source. Sagnac interferometer and single mode fiber, a laser with 1,550 nm in wavelength, $2{\times}2$ coupler were used. Based on the experimental results, lay direction's sensitivity is the highest in the frequency range of 2 kHz~4 kHz. 'PTFE+carbon' material is more sensitive than PTFE in the frequency range of 5 kHz~20 kHz. Sound pressure detection sensitivity depends on the mandrel direction and material under certain frequency.
Keywords
Fiber Optic Sensor; Hollow Cylinder Mandrel; Acoustic Frequency Spectrum; Sagnac Interferometer; Sound Pressure Sensitivity;
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