【摘要】 针对传统光纤传感难以实现应变矢量感知的问题，设计并实验验证了基于同相正交（IQ）调制的光频域反射仪（OFDR）的多芯光纤应变矢量传感系统。使用IQ调制技术，实现了光源线性扫频，利用多芯光纤空间结构关系，在OFDR系统中获得了七芯光纤弯曲后的应变矢量信息。实验结果表明，当光源扫频范围990 MHz时，在87 m七芯光纤中，弯曲应变空间分辨率为28.35 cm。当光纤弯曲曲率为1.78 m^-1时，角度分辨率为29°。同时进一步通过仿真分析表明，当扫频范围提高到10 GHz时，理论上可以达到1.02°的角度分辨率，从而进一步提高系统性能。更多还原

【Abstract】 Typically, the realization of strain vector sensing based on traditional optical fiber sensing is difficult. To address this, in this study, a multi-core optical fiber strain vector sensing system based on an in-phase and quadrature（IQ）modulated optical frequency domain reflector（OFDR） is designed and verified. The IQ modulation technique is used to perform a linear frequency sweep of the light source, and the strain vector information of a seven-core fiber after bending is obtained from the OFDR system using the spatial structure relation of multi-core fibers. Experimental results demonstrate that the spatial resolution of the bending strain is 28. 35 cm in an 87 m seven-core fiber with a sweep frequency of 990 MHz. When the bending curvature of the optical fiber is 1. 78 m^-1, the angular resolution is 29°. Moreover, the simulation analysis indicates that when the sweep frequency range increases to 10 GHz, a theoretical angular resolution of 1. 02° can be achieved, which can further improve the system performance.更多还原