锥形光纤马赫-曾德尔干涉仪，用于超高灵敏度折射率测量。

Tapered Fiber-Optic Mach-Zehnder Interferometer for Ultra-High Sensitivity Measurement of Refractive Index.

机构信息

Department of Mechanical Engineering, University of Victoria, Victoria, BC V8W 2Y2, Canada.

Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.

出版信息

Sensors (Basel). 2019 Apr 6;19(7):1652. doi: 10.3390/s19071652.

A Mach-Zehnder interferometer (MZI) based fiberoptic refractive index (RI) sensor is constructed by uniformly tapering standard single mode fiber (SMF) for RI measurement. A custom flame-based tapering machine is used to fabricate microfiber MZI sensors directly from SMFs. The fabricated MZI device does not require any splicing of fibers and shows excellent RI sensitivity. The sensor with a cladding diameter of 35.5 µm and length of 20 mm exhibits RI sensitivity of 415 nm/RIU for RI range of 1.332 to 1.384, 1103 nm/RIU for RI range of 1.384 to 1.4204 and 4234 nm/RIU for RI range of 1.4204 to 1.4408, respectively. The sensor reveals a temperature sensitivity of 0.0097 nm/°C, which is relatively low in comparison to its ultra-high RI sensitivity. The proposed inexpensive and highly sensitive optical fiber RI sensors have numerous applications in chemical and biochemical sensing fields.

基于马赫-曾德尔干涉仪（MZI）的光纤折射率（RI）传感器通过对标准单模光纤（SMF）进行均匀锥化来构建，用于 RI 测量。使用定制的基于火焰的锥化机直接从 SMF 制造微光纤 MZI 传感器。制造的 MZI 器件不需要任何光纤拼接，并且表现出优异的 RI 灵敏度。具有 35.5 µm 包层直径和 20 mm 长度的传感器在 RI 范围为 1.332 至 1.384 时表现出 415nm/RIU 的 RI 灵敏度，在 RI 范围为 1.384 至 1.4204 时表现出 1103nm/RIU 的 RI 灵敏度，在 RI 范围为 1.4204 至 1.4408 时表现出 4234nm/RIU 的 RI 灵敏度。该传感器显示出 0.0097nm/°C 的温度灵敏度，与超高 RI 灵敏度相比相对较低。所提出的廉价且高灵敏度的光纤 RI 传感器在化学和生物化学传感领域具有众多应用。