基于最大射频强度判别法的温度传感波长解调研究

针对基于射频非平衡马赫-曾德尔干涉仪的光纤布拉格光栅传感器波长解调系统的特性展开研究,实验测量了由非相干光损耗、器件插损及光纤光栅的反射谱宽引起的系统的输出功率衰减。提出选取某个特定微波频率输出强度,针对一定量的样本观测值,采用最大射频强度判别法进行数据处理的完整方法。实验还通过描绘各频率点输出强度最大值得到该波长解调系统频率响应,以119.96 MHz作为调制频率得到0.1692 dB/℃的传感灵敏度。本实验对于非相干光与微波光子滤波器在光纤传感应用过程中的性能改进与可行性研究具有实际参考意义。     

Time Division Multiplexing Fiber Bragg Grating Sensor System Using Composite Codes

A novel multi-point sensing scheme to improve the signal-to-noise ratio(SNR), temperature measurement range of the fiber Bragg grating(FBG) sensors is proposed. The new sensing scheme adopted a composite coding technique based on Simplex codes and Golay codes and time division multiplexing technique to enhance the performance of the sensing system. Simulation results, in good agreement with the theory, confirmed that the maximum SNR enhancement of the sensor system employing composite coding based on 15-bit Simplex codes and 16-bit Golay codes was approximately 6.01 dB in comparison to the conventional single pulse case.