Stretchable strain sensors are urgently needed in measurement field. This paper reports a no-core polydimethylsiloxane (PDMS) optical sensor, which is suitable for large scale strain and concentration measurement with high sensitivity. The proposed no-core PDMS fiber is composed of polydimethylsiloxane and curing agent in a certain propotion. The output spectrum loss of the no-core PDMS fiber varies with stretching or surrounding changes. Experimental results show that the highest strain sensitivity is 3.5070 /ε in the range from 0% to 25%. Also, intensity change of the output spectrum is linear with brine concentrations from 2.5% to 10%. The proposed no-core PDMS fiber has the potential to be used in some fields such as wearable devices, structure health in composite materials, civil structures, and concentration measurement.

在测量领域迫切需要可拉伸的应变传感器。本文报道了一种无芯聚二甲基硅氧烷（PDMS）光学传感器，它适用于大规模应变和高灵敏度的浓度测量。提出的无芯PDMS纤维由聚二甲基硅氧烷和一定比例的固化剂组成。无芯PDMS光纤的输出频谱损耗随拉伸或周围环境变化而变化。实验结果表明，在0％到25％的范围内，最高应变灵敏度为3.5070 /ε。而且，输出光谱的强度变化与盐水浓度从2.5％到10％呈线性关系。提出的无芯PDMS纤维具有在某些领域中使用的潜力，例如可穿戴设备，复合材料中的结构健康，土木结构和浓度测量。