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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。
A multi-channel fiber Fabry-Perot (FP-P) pressure sensing demodulation system based on LED pulse modulation and fiber array is proposed. Based on the established multi-channel optical path difference distribution theory model, the multiplexing of multi-channel parallel optical paths is realized by adopting an optical fiber array, and the switching of multiple channels is realized by adopting the LED pulse modulation method. The method can effectively restrain consumption Layer (PN junction) temperature increases, reducing the PN junction temperature rise on the demodulation. The effects of duty cycle and frequency of LED pulse modulation are experimentally studied, which shows that the optimal demodulation effect is achieved when the duty cycle is less than 60% and the modulation frequency is greater than 35 Hz. Experiments with an 8-channel demodulation system with a 50 Hz pulse rate and a duty cycle of 12.5% demonstrate good demodulation consistency across channels and within 0.045% of all channels in the full-scale range (F.S.).