提出一种基于新型多芯少模光纤模式干涉原理的位移传感器,该传感器由两段单模光纤和一段多芯少模光纤组成。研究了该传感器的实现原理,并实验验证。实验结果表明当光纤轴向被拉伸0~60μm时,该新型传感器的检测灵敏度为-61.17pm/μm,与理论计算结果之间的误差小于3.9%。因此,当使用高分辨率光谱仪作为接收器时,该传感器可检测17nm的位移变化。 A new type of displacement sensor based on the principle of multi-core and few-mode fiber mode interference is proposed. The sensor consists of two sections of single mode fiber and a section of multi-core and few mode fiber. The realization principle of the sensor is studied and verified experimentally. The experimental results show that the detection sensitivity of the new sensor is -61.17pm / μm when the optical axis is stretched from 0μm to 60μm, which is less than 3.9% of theoretical error. Therefore, when using a high-resolution spectrometer as a receiver, the sensor can detect a displacement change of 17 nm.