光学学报, 2015, 35 (6): 0606001, 网络出版: 2015-05-28   

基于LED调制和光纤阵列的多通道光纤法布里-珀罗传感解调系统研究

Research on Multi-Channel Optical Fiber Fabry-Perot Sensing Demodulation System Based on LED Modulation and Optical Fiber Array
作者单位
天津大学精密仪器与光电子工程学院, 光电信息技术教育部重点实验室, 光纤传感研究所, 天津 300072
摘要
提出了一种基于发光二极管(LED)脉冲调制和光纤阵列的多通道光纤法布里-珀罗(F-P)压力传感解调系统。在建立的多通道光程差分布理论模型基础上,通过采用光纤阵列实现了多通道并行光路的复用,并采用LED脉冲调制的方法实现了多个通道的切换,该方法能够有效地抑制耗尽层(PN 结)温度升高,减小因PN 结温度升高对解调的影响。实验研究了LED 脉冲调制的占空比和频率的影响,表明在占空比低于60%、调制频率大于35 Hz时具有最优的解调效果。采用脉冲调制频率为50 Hz、占空比为12.5%的8 通道解调系统实验表明,各通道解调一致性很好,并且在全量程范围(F.S.)所有通道的误差均在0.045%以内。
Abstract
A multi-channel optical fiber Fabry-Perot (F-P) sensing demodulation system based on light emitting diode (LED) pulse demodulation and optical fiber array is proposed. Based on multi-channel optical path difference distribution theory model, multi- channel parallel light path is realized with optical fiber array and LED pulse demodulation is used for channel switching, which alleivates the temperature rising of positive- negative (PN) junction and the influence of the PN′s rising temperature on demodulation. The experiments investigate the effects of pulse duty cycle and modulation frequency. The results show that the demodulation can be in good perfermance when duty cycle is less than 60% and the modulation frequency is higher than 35 Hz. Using pulse modulation with 50 Hz and 12.5% duty cycle, the experiment results show that the 8-channel system has good channel consistency, and the modulation precisions of all 8 channels are less than 0.045% in full scale(F.S.).

江俊峰, 秦尊琪, 王双, 刘铁根, 刘琨, 尹金德, 邹盛亮, 石俊锋, 曹潇. 基于LED调制和光纤阵列的多通道光纤法布里-珀罗传感解调系统研究[J]. 光学学报, 2015, 35(6): 0606001. Jiang Junfeng, Qin Zunqi, Wang Shuang, Liu Tiegen, Liu Kun, Yin Jinde, Zou Shengliang, Shi Junfeng, Cao Xiao. Research on Multi-Channel Optical Fiber Fabry-Perot Sensing Demodulation System Based on LED Modulation and Optical Fiber Array[J]. Acta Optica Sinica, 2015, 35(6): 0606001.

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