Abstract
A novel temperature sensor based on a Teflon capillary encapsulated 2 × 2 optical microfiber coupler (OMC) filled with refractive index matching liquids is described. The sealed capillary and the filling liquid are demonstrated to enhance the temperature sensing performance, achieving a high temperature sensitivity of 5.3 nm/°C. To the best of our knowledge, the temperature sensor described in this article exhibits the highest sensitivity among the OMC structure based fiber optic temperature sensors. Experimental results also show that it has good repeatability along with a fast response time of 243 ms.
Highlights
Rapid recent progress in micro optical fiber processing technology has resulted in the correspondingly rapid development of novel micro/nano optical devices
Temperature sensors are widely used as micro/nano optical fiber sensors and recent improvements in the technology has resulted in greatly improved performance and reliability
Most of the proposed optical fiber temperature sensors are based on micron scale processing of single-mode fiber (SMF) optical fiber, fiber gratings [3,4,5,6], couplers and ring resonators [7,8,9], tapered fibers coated by thermo-sensitive material [10, 11], and high birefringence photonic crystal fibers (HBFs) with liquid-filled cores [12, 13]
Summary
Rapid recent progress in micro optical fiber processing technology has resulted in the correspondingly rapid development of novel micro/nano optical devices. For most micro/nano temperature sensors based on traditional silica fiber structures, their temperature sensitivity is normally below 0.3 nm/°C [14], which is mainly limited by the small thermo-optic coefficient difference between the fiber core and cladding. To overcome these limitations, Qian et al have selectively filled a temperature sensitive liquid, such as alcohol in the air holes of a photonic crystal fiber to improve the thermo-optic coefficient, and achieved an extra-high sensitivity of 6.6 nm/°C [15]. This proposed temperature sensor provides a favorable choice for applications including industrial production and environmental monitoring
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