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Experimental Study on Dual-Structure Polymer Optical Fiber Sensors for Turbidity Detection
Jiafeng Zhang1, Zhibin Liu2, Junshi Li1
1Shanghai CAAC New Era Airport Design & Research Institute Co., Ltd., Shanghai 200335, China.
Sensors (Basel, Switzerland)
|January 28, 2026
Summary
Polymer optical fiber (POF) sensors effectively monitor turbidity in particle suspensions. The Gap-POF sensor shows superior sensitivity, especially at high concentrations, making it ideal for real-time applications.
Area of Science:
- Optical sensing
- Material science
- Environmental monitoring
Background:
- Turbidity monitoring is crucial for assessing water quality and industrial processes.
- Polymer optical fibers (POFs) offer potential advantages for in-situ sensing due to their flexibility and cost-effectiveness.
- Existing turbidity sensors may have limitations in sensitivity or applicability to diverse particle types.
Purpose of the Study:
- To investigate and compare the performance of two POF sensor types (RR-POF and Gap-POF) for turbidity monitoring.
- To evaluate the sensors' response to varying particle concentrations and compositions (silica and clay).
- To determine the influence of wavelength on sensor performance for turbidity measurements.
Main Methods:
- Utilized reflection-refraction type (RR-POF) and gap type (Gap-POF) sensors.
- Introduced silica powder and clay particles into water at different concentrations.
- Measured changes in light intensity transmitted through the suspensions.
- Conducted experiments using multiple wavelengths (white, green, red, blue).
Main Results:
- A significant inverse correlation was observed between particle concentration and light intensity for both POF sensors.
- Gap-POF demonstrated higher sensitivity to turbidity, particularly at elevated particle concentrations.
- Particle composition affected sensor response: silica caused irregular fluctuations, while clay resulted in more stable changes.
- White and green light wavelengths showed the strongest response to turbidity variations.
Conclusions:
- Both RR-POF and Gap-POF sensors are effective for turbidity monitoring.
- Gap-POF exhibits superior performance in high-concentration particle suspensions.
- POF sensors, especially Gap-POF, are well-suited for real-time turbidity monitoring in diverse suspension systems.
- Wavelength selection can optimize turbidity sensing performance.
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