This paper presents a temperature-insensitive optical fiber strain sensor composed of single-mode fiber (SMF), no core fiber (NCF), and few-mode fiber (FMF). The NCF is fused to two FMFs with core-offset, exciting higher-order modes and generating mode interference. Experimental results demonstrate that the strain sensitivity of the optical fiber sensor can reach − 19.19 pm/με in a strain range from 0 to 600 με. Moreover, within a temperature range from 30℃ to 70℃, the strain-temperature crosstalk of the proposed sensor is remarkably low at 0.104 με/℃. This sensor is easy to fabricate, cost-effective, reusable, and shows promising applications in food processing, civil engineering, aerospace, and other fields.

本文提出了一种由单模光纤（SMF）、无芯光纤（NCF）和少模光纤（FMF）组成的温度不敏感光纤应变传感器。NCF 融合到两个具有核心偏移的 FMF，激发高阶模式并产生模式干扰。实验结果表明，在0~600με应变范围内，光纤传感器的应变灵敏度可以达到-19.19 pm/με。此外，在30℃至70℃的温度范围内，所提出的传感器的应变-温度串扰非常低，为0.104με/℃。该传感器易于制造、成本效益高、可重复使用，在食品加工、土木工程、航空航天等领域显示出广阔的应用前景。