Abstract A polydimethylsiloxane (PDMS) packaged microfiber knot ring (MKR) resonator was used as a load-sensing probe. Based on the large Young’s modulus and low elastic effect of the silica, the load-sensing characteristic of the bare MKR was experimentally verified with a sensitivity of 6 pm/N. The sensitivity and stability were improved significantly after the MKR was encapsulated in the PDMS film. When the load was applied, the PDMS deformed due to the elastic effect, which in turn changed the length of the MKR. When the microfiber and ring diameter were 7.20 μm and 4.0 mm, respectively, a load sensitivity of 90 pm/N was experimentally demonstrated in the working range from 10 to 50 N. The corresponding strain sensitivity was 0.038 pm/με. The impacts from both the microfiber diameter and ring length on the load-sensing performance were analyzed as well. The experimental results show that the higher sensitivity needs a smaller ring diameter but is independent on the microfiber diameter. This MKR load-sensing probe is promising for exploring miniature sensor chips, due to advantages of low cost, simple and rapid fabrication, and the compact structure.

中文翻译：

---

封装在聚二甲基硅氧烷 (PDMS) 中的超细纤维结环 (MKR) 的负载传感

摘要 聚二甲基硅氧烷 (PDMS) 封装的超细纤维结环 (MKR) 谐振器用作负载传感探头。基于二氧化硅的大杨氏模量和低弹性效应，裸 MKR 的负载传感特性经过实验验证，灵敏度为 6 pm/N。将 MKR 封装在 PDMS 薄膜中后，灵敏度和稳定性显着提高。当施加载荷时，PDMS 由于弹性效应而变形，这反过来又改变了 MKR 的长度。当超细纤维和环直径分别为 7.20 μm 和 4.0 mm 时，在 10 至 50 N 的工作范围内实验证明了 90 pm/N 的负载灵敏度。相应的应变灵敏度为 0.038 pm/με。还分析了微纤维直径和环长度对负载传感性能的影响。实验结果表明，更高的灵敏度需要更小的环直径，但与微纤维直径无关。这种MKR负载传感探头具有成本低、制造简单快速、结构紧凑等优点，有望用于探索微型传感器芯片。