为了获得更高的线性度和更强的抗干扰能力, 提出一种改进的相位生成载波解调算法.利用滤去直流量的干涉信号及其与基频相混频的信号来进行运算, 将两路信号倍频后的差分结果与其相乘后的微分结果相除来实现对被测信号的解调.该方法可有效消除光源扰动和直流分量对解调结果的影响.仿真结果验证了改进解调算法的可行性及优势, 与传统算法相比获得了更高的线性度和更强的抗干扰能力, 并打破了基频混频只适用于小信号的局限性.搭建实验系统进行验证, 结果表明改进算法的频率解调准确率较高, 且强度响应一致性较好.

In order to obtain higher linearity and stronger anti-interference ability, an improved phase generation carrier demodulation algorithm was proposed. By using the interference signal and the base frequency mixing signal to perform the operation, the difference between the two signal times and the two signals is differentiated and the demodulation of the detected signal is realized. The simulation results verify the feasibility and advantages of the improved demodulation algorithm, the stronger anti-interference ability and higher linearity are obtained comparing with the conventional demodulation method, and the limitations that the fundamental frequency mixer applies only to the limitations of small signal is eliminated; The experimental system is built to verify the high accuracy of frequency demodulation and the consistency of the intensity response.