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Long distance fiber-optic displacement sensor based on fiber collimator
Wei Shen1, Xiaowei Wu, Hongyun Meng
1Key laboratory of Photonic Information Technology of Guangdong Higher Education Institutes, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, People's Republic of China.
The Review of Scientific Instruments
|January 5, 2011
Summary
A novel fiber-optic displacement sensor offers a sensing range over 30 cm, significantly exceeding conventional sensors. This enhanced sensor utilizes reflective intensity modulation for improved industrial applications.
Area of Science:
- Optoelectronics
- Fiber Optics Sensing
Background:
- Conventional fiber-optic displacement sensors have limited sensing ranges.
- Intensity modulation techniques are widely used but can be affected by environmental factors.
Purpose of the Study:
- To demonstrate a simple fiber-optic displacement sensor with an extended sensing range.
- To improve the stability and accuracy of fiber-optic displacement measurements.
Main Methods:
- Utilizing a fiber collimator with reflective intensity modulation technology.
- Employing a relative technique to eliminate errors from light source fluctuations and environmental influences.
Main Results:
- Achieved a sensing range exceeding 30 cm, over 100 times that of conventional sensors.
- Demonstrated high linearity with R-square values > 0.995.
- Obtained a sensitivity of 0.426 dB/cm over the 5-30 cm range.
Conclusions:
- The developed fiber-optic displacement sensor offers a significantly extended dynamic range and high stability.
- Its simple design, robustness, and ease of fabrication make it suitable for industrial applications.
- The relative technique effectively enhances measurement accuracy and stability.
