多通道光栅传感解调系统的信号同步分析

Signal synchronization analysis of multi-channel grating sensing demodulation system

多通道光栅传感解调系统的解调精度和信号同步程度存在直接关联,为保证解调效果,研究多通道光栅传感解调系统的信号同步方法。基于多通道光栅传感解调系统的应用原理,确定解调过程中相邻光栅传输时延,导致反射光信号发生重叠,无法保证多通道信号同步;充分分析解调系统信号时延情况后,采用卡尔曼滤波方法,依据频率偏差补偿完成相位偏差补偿,实现多通道同步时间补偿,以此完成多通道光栅传感解调系统的信号同步。测试结果显示:采用研究方法进行多通道光栅传感解调系统信号同步后,时间同步偏差结果均低于0.15 ms;并且信号同步后解调系统的解调误码率均低于0.55%;解调后最大漂移结果为0.007 8 nm;可有效避免反射光信号发生重叠。

The demodulation precision of multi-channel grating sensing demodulation system is directly related to the degree of signal synchronization.In order to ensure the demodulation effect,the signal synchronization method of multi-channel grating sensing demodulation system is studied.Based on the application principle of multi-channel grating sensing demodulation system,it is determined that the transmission delay of adjacent gratings in the process of demodulation leads to overlapping of reflected optical signals and cannot guarantee the synchronization of multi-channel signals.After fully analyzing the signal delay of the demodulation system,Kalman filter method is used to complete the phase deviation compensation according to the frequency deviation compensation,and realize the multi-channel synchronous time compensation,so as to complete the signal synchronization of the multi-channel grating sensor demodulation system.The test results show that the time synchronization deviation is lower than 0.15 ms after the signal synchronization of multi-channel grating sensing demodulation system is carried out by the research method.The bit error rate of demodulation system after signal synchronization is lower than 0.55%.The maximum drift after demodulation is 0.0078 nm.It can effectively avoid overlapping of reflected light signals.