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Highly sensitive temperature sensor using a Sagnac loop interferometer based on a side-hole photonic crystal fiber
Applied Optics
|January 14, 2017
Summary
A novel fiber-optic temperature sensor uses metal-filled photonic crystal fiber (PCF) to achieve high sensitivity. Indium-filled PCF demonstrated a remarkable temperature sensitivity of -9.0 nm/°C.
Area of Science:
- Optoelectronics
- Materials Science
- Fiber Optics
Background:
- Fiber-optic sensors offer advantages in harsh environments.
- Photonic Crystal Fibers (PCFs) provide unique light-manipulating properties.
- Temperature sensing is crucial in various industrial and scientific applications.
Purpose of the Study:
- To propose and demonstrate a highly sensitive fiber-optic temperature sensor.
- To investigate the effect of metal fillers in PCF on temperature sensitivity.
- To explore the relationship between fiber microstructure and sensor performance.
Main Methods:
- An all-fiber Sagnac loop interferometer was constructed.
- Side-hole PCFs were fabricated and filled with bismuth and indium.
- Temperature sensitivity was measured and compared with numerical simulations.
Main Results:
- A high temperature sensitivity of -9.0 nm/°C was achieved using indium-filled PCF.
- Bismuth-filled PCF also exhibited temperature-dependent birefringence.
- Experimental results showed good agreement with numerical simulations.
Conclusions:
- Metal-filled PCF is a promising structure for high-sensitivity fiber-optic temperature sensing.
- The fiber microstructure significantly influences birefringence modulation due to metal expansion.
- Indium-filled PCF offers superior temperature sensitivity compared to bismuth-filled PCF.
