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Updated: Oct 16, 2025
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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Optical Fiber Sensor for Temperature and Strain Measurement Based on Multimode Interference and Square-Core Fiber
Kun Wang1, Xingchen Dong1, Patrick Kienle1
1Department of Electrical and Computer Engineering, Institute for Measurement Systems and Sensor Technology, Technical University of Munich, Theresienstraße 90, 80333 Munich, Germany.
Micromachines
|October 23, 2021
Summary
This study demonstrates a novel square-core fiber sensor for precise temperature and strain detection. The fiber sensor shows high sensitivity for temperature sensing with minimal cross-sensitivity to strain.
Area of Science:
- Optics and Photonics
- Materials Science
- Sensor Technology
Background:
- Specialty optical fibers, including no-core fiber (NCF), are recognized for their sensing capabilities.
- Investigating novel fiber structures is crucial for advancing sensor technology.
Purpose of the Study:
- To explore the temperature and strain sensing performance of a square-core fiber.
- To fabricate and characterize a single-mode-multimode-single-mode (SMS) fiber sensor using square-core fiber.
Main Methods:
- Fabrication of a 30-cm-long SMS fiber sensor incorporating a section of square-core fiber.
- Experimental measurement of wavelength and power shifts in response to temperature and strain variations.
Main Results:
- Maximal wavelength sensitivities of -15.3 pm/°C (temperature) and -1.5 pm/με (strain) were achieved.
- Maximal power sensitivities were 0.0896 dBm/°C (temperature) and 0.0756 dBm/με (strain).
- The sensor exhibited significantly higher temperature sensitivity compared to strain sensitivity.
Conclusions:
- The square-core fiber sensor demonstrates potential for high-sensitivity temperature monitoring.
- The sensor exhibits low sensitivity to strain, indicating good selectivity for temperature measurements.
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