Long distance fiber-optic displacement sensor based on fiber collimator

A simple fiber-optic displacement sensor based on reflective intensity modulated technology is demonstrated using a fiber collimator. The sensing range is over 30 cm, which is over 100 times that of the conventional fiber-optic displacement sensor based on the normal single-mode fiber. The measured...

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Bibliographic Details
Published in:Review of scientific instruments 2010-12, Vol.81 (12), p.123104-123104-4
Main Authors: Shen, Wei, Wu, Xiaowei, Meng, Hongyun, Zhang, Guanbin, Huang, Xuguang
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COLLIMATORS
DESIGN
DISTANCE
EQUATIONS
Equipment Design
ERRORS
FIBER OPTICS
FLUCTUATIONS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
LIGHT SOURCES
Optical Fibers
OPTICAL REFLECTION
SENSITIVITY
SENSORS
STABILITY
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Summary:A simple fiber-optic displacement sensor based on reflective intensity modulated technology is demonstrated using a fiber collimator. The sensing range is over 30 cm, which is over 100 times that of the conventional fiber-optic displacement sensor based on the normal single-mode fiber. The measured data are fitted into linear equation very well and the values of R-square are more than 0.995. The sensitivity of the device achieves 0.426 dB/cm over the range of 5–30 cm. By applying the relative technique, the errors resulted from the fluctuation of light source and influences of environment are effectively eliminated, and the stability for wide range measurement can be improved. The simplicity of the design, high dynamic range, stability and the ease of the fabrication make it suitable for applications in industries.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3518971