基于相位解调的双光束薄膜干涉型光纤传声器
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摘要
针对基于相位解调的双光束薄膜干涉型光纤传声器的特性展开了研究,仿真分析了三路信号的直流分项、交流分项以及相位差对双光束薄膜干涉型光纤传声器输出性能的影响。采用对比法,并通过实验研究了基于相位解调的双光束薄膜干涉型光纤传声器的输出特性,实现了灵敏度为193 mV/Pa@1 kHz、频率响应为200 Hz～4 kHz@±3 dB的声信号测量。本研究能够很好地应用于声探测、语音识别等领域。
The performances of a double-beam thin-film interferometric fiber(DBTFIF) microphone based on phase demodulation is studied. The effects of the direct current(DC) subentry, alternating current(AC) subentry and phase difference of three interference signals on the output performances of this DBTFIF microphone are analyzed by simulation. Through the comparison method, the output performances of this DBTFIF microphone based on phase demodulation are studied experimentally as well. The experimental results show that the measurement of acoustic signals with a sensitivity of about 193 mV/Pa at 1 kHz and the frequency response ranging from 200 Hz to 4 kHz with a fluctuation of about 士 3 dB can both be achieved. This research can be well used in the fields of acoustic detection, voice recognition, and so on.
The performances of a double-beam thin-film interferometric fiber(DBTFIF) microphone based on phase demodulation is studied. The effects of the direct current(DC) subentry, alternating current(AC) subentry and phase difference of three interference signals on the output performances of this DBTFIF microphone are analyzed by simulation. Through the comparison method, the output performances of this DBTFIF microphone based on phase demodulation are studied experimentally as well. The experimental results show that the measurement of acoustic signals with a sensitivity of about 193 mV/Pa at 1 kHz and the frequency response ranging from 200 Hz to 4 kHz with a fluctuation of about 士 3 dB can both be achieved. This research can be well used in the fields of acoustic detection, voice recognition, and so on.
引文
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[17] Chen W M, Lei X H, Zhang W, et al. Recent progress of optical fiberFabry-Perot sensors[J]. Acta Optica Sinca, 2018, 38(3):0328010.陈伟民,雷小华,张伟,等.光纤法布里-珀罗传感器研究进展[J].光学学报,2018, 38(3):0328010.
[2] Chen K, Yuan S, Gong Z F, et al. Ultra-high sensitive photoacoustic spectrometer for trace gas detection basedon fiber-optic acoustic sensors[J]. Acta Optica Sinica,2018, 38(3):0328015.陈珂,袁帅,宫振峰,等.基于光纤声波传感的超高灵敏度光声光谱微量气体检测[J].光学学报,2018, 38(3):0328015.
[3] Ding P, Dong X P. Theoretical and experimental research on fiber-optic microphone using multimode fiber lens[J]. Laser&Optoelectronics Progress, 2012,49(6):060603.丁朋,董小鹏.采用多模光纤透镜的光纤麦克风理论与实验研究[J].激光与光电子学进展,2012, 49(6):060603.
[4] Bandutunga C P, Fleddermann R, Gray M B, et al. Alloptical low noise fiber Bragg grating microphone[J].Applied Optics, 2016, 55(21):5570-5574.
[5] Wu D F, Jia B. Theoretical and experimental research of all-fiber microphone based on M-z interferometer[J].Chinese Journal of Sensors and Actuators, 2007, 20(7):1528-1530.吴东方,贾波.基于M-Z动态干涉仪的全光纤麦克风研究[J].传感技术学报,2007, 20(7):1528-1530.
[6] Liu L, Lu P, Liao H, et al. Fiber-optic Michelson interferometric acoustic sensor based on a PP/PET diaphragm[J]. IEEE Sensors Journal, 2016, 16(9):3054-3058.
[7] Wang Q, Yu Q. Polymer diaphragm based sensitive fiber optic Fabry-Perot acoustic sensor[J]. Chinese Optics Letters, 2010, 8(3):266-269.
[8] Ma J, Xuan H F, Ho H L, et al. Fiber-optic FabryPérot acoustic sensor with multilayer graphene diaphragm[J]. IEEE Photonics Technology Letters,2013, 25(10):932-935.
[9] Liu L, Lu P, Wang S, et al. UV adhesive diaphragmbased FPI sensor for very-low-frequency acoustic sensing[J]. IEEE Photonics Journal, 2016, 8(1):6800709.
[10] Liu B, Lin J, Wang J, et al. MEMS-based highsensitivity Fabry-Perot acoustic sensor with a 45°angled fiber[J]. IEEE Photonics Technology Letters, 2016, 28(5):581-584.
[11] Wang W, Wu N, Tian Y, et al. Miniature all-silica optical fiber pressure sensor with an ultrathin uniform diaphragm[J]. Optics Express, 2010, 18(9):9006-9014.
[12] Wang K B, Zhou Y, Liu C, et al. The F-P interferometric fiber optic microphone with intensity demodulation[J]. Journal of Applied Acoustics, 2017,36(5):438-444.王坤博,周瑜,刘超,等.强度解调的F-P干涉型光纤传声器[J].应用声学,2017, 36(5):438-444.
[13] Mao X F, Tian X R, Zhou X L, et al. Characteristics ofa fiber-optical Fabry-Perot interferometric acoustic sensor based on an improved phase-generated carrierdemodulation mechanism[J]. Optical Engineering,2015, 54(4):046107.
[14] Schmidt M, Fiirstenau N. Fiber-optic extrinsic Fabry-Perot interferometer sensors with threewavelength digital phase demodulation[J]. Optics Letters, 1999, 24(9):599-601.
[15] Jiang Y, Chen S F. Direct demodulation for signal from fiber grating sensors by interferometer based on3×3 coupler[J]. Acta Optica Sinica, 2004, 24(11):1487-1490.江毅,陈淑芬.用3×3耦合器的干涉仪直接解调光纤光栅传感器的信号[J].光学学报,2004, 24(11):1487-1490.
[16] Jiang Y. Passive interrogation of an extrinsic FabryPerot interferometer using a three-wavelength method[J]. Optical Engineering, 2009, 48(6):064401.
[17] Chen W M, Lei X H, Zhang W, et al. Recent progress of optical fiberFabry-Perot sensors[J]. Acta Optica Sinca, 2018, 38(3):0328010.陈伟民,雷小华,张伟,等.光纤法布里-珀罗传感器研究进展[J].光学学报,2018, 38(3):0328010.