Abstract. A Mach–Zehnder interferometer based on S-taper embedded in long-period grating (LPG) for simultaneous measurement of strain and temperature is proposed. The LPG is written using CO2 laser in a single-mode fiber. Then an S-taper is made by putting the LPG in a fusion splicer and applying off-axis pull at the middle point. The spectral characteristics of strain and temperature are investigated theoretically and experimentally. The experimental results show that the maximum strain sensitivity is 53.6 pm / με within a strain range of 0 to 373.13 με. In additionally, the proposed sensor has a maximum temperature sensitivity of 70 pm / ° C when the temperature varies from 30°C to 90°C. Further analysis shows that this sensor could be applied for simultaneous measurement of strain and temperature.

中文翻译：

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基于S-taper嵌入长周期光栅的应变和温度传感器

摘要。提出了一种基于嵌入长周期光栅 (LPG) 的 S 锥度的 Mach-Zehnder 干涉仪，用于同时测量应变和温度。LPG 是使用 CO2 激光器在单模光纤中写入的。然后通过将 LPG 放入熔接机中并在中间点施加离轴拉力来制作 S 型锥度。从理论上和实验上研究了应变和温度的光谱特性。实验结果表明，在0~373.13 με的应变范围内，最大应变灵敏度为53.6 pm/με。此外，当温度从 30°C 到 90°C 变化时，所提出的传感器的最大温度灵敏度为 70 pm/°C。进一步分析表明，该传感器可用于同时测量应变和温度。