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利用三态偏振分集求平方和的方法解决基于外差解调算法的干涉型光纤传感系统中偏振衰落问题。首先理论分析了偏振分集接收的基本原理,并推导了三态偏振分集平方和法在外差解调系统中的可行性,然后制作了无偏振补偿的光栅型水听器单元进行验证,理论仿真与实验结果表明采用三态偏振分集平方和法可以有效抑制传感单元内的偏振衰落现象,为新型的光栅干涉型传感系统的实用化提供解决方案。
Solving Polarization Fading in Interferometric Fiber Optic Sensing System Based on Heterodyne Demodulation Algorithm by Triangular Polarization Diversity. First of all, the principle of polarization diversity reception is analyzed theoretically, and the feasibility of three-state polarization diversity summing method in heterodyne demodulation system is deduced. Then, a grating-type hydrophone unit without polarization compensation is fabricated for verification, theoretical simulation and Experimental results show that the three-state polarization diversity square-sum method can effectively suppress the phenomenon of polarization fading in the sensing unit and provide a solution for the practical application of the novel grating interference sensing system.