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Updated: Aug 10, 2025
09:48
Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
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Temperature and Humidity Stability of Fibre Optic Sensor Cables for High Resolution Measurements.
Marcus Maier1, Cedric Kechavarzi2, Xiaomin Xu2
1Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK.
Sensors (Basel, Switzerland)
|February 11, 2023
Summary
Fibre optic sensing (FOS) in concrete requires careful cable selection. Calibration factors vary with temperature and humidity, and cable drift impacts accuracy. Pre-conditioning cables can improve measurement fidelity.
Area of Science:
- Materials Science
- Civil Engineering
- Sensor Technology
Background:
- Fibre optic sensors (FOS) enable real-time monitoring of concrete structures.
- Decoupling strain, temperature, and humidity influences on FOS is challenging.
- FOS cable composition affects time and spatial stability of measurements.
Purpose of the Study:
- Investigate the impact of environmental factors on FOS calibration and stability.
- Evaluate different FOS cable types for concrete applications.
- Determine optimal conditions for accurate FOS measurements in concrete.
Main Methods:
- Tested five FOS cable types (three strain, two temperature) under controlled temperature and humidity cycles.
- Used a high-resolution optical backscatter reflectometer for interrogation.
- Analyzed calibration factor differences and signal drift during exposure.
Main Results:
- Calibration factors differed between increasing and decreasing temperature/humidity cycles.
- The third temperature cycle showed minimal heating-cooling differences, suggesting pre-conditioning benefits.
- All cables exhibited drift during sustained temperature (2.5h) and humidity (30h) exposures.
- Local frequency fluctuations were observed along the cable length.
Conclusions:
- Cable selection is crucial for maximizing FOS measurement fidelity in concrete.
- Environmental factors significantly influence FOS accuracy and stability.
- Temperature pre-conditioning may enhance measurement reliability.
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