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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
Development of a differential optical-fiber displacement sensor
F Suganuma1, A Shimamoto, K Tanaka
1Department of Mechanical Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, 940-2188 Japan.
Applied Optics
|February 29, 2008
Summary
This study introduces a new optical-fiber displacement sensor. Its design ensures accurate measurements regardless of target reflectivity, enhancing reliability for various applications.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Fiber Optics
Background:
- Optical-fiber sensors offer non-contact measurement capabilities.
- Sensitivity to target reflectivity can be a limitation in existing designs.
- Accurate displacement sensing is crucial in industrial and scientific fields.
Purpose of the Study:
- To propose and demonstrate a novel optical-fiber displacement sensor.
- To develop a sensor design that is independent of target reflectivity.
- To analyze the geometric parameters influencing sensor performance.
Main Methods:
- Utilized a laser diode light source and a specially bundled optical-fiber probe.
- Sectioned the fiber bundle into illumination (central fiber), receiving part I (first-neighbor fibers), and receiving part II (remaining fibers).
- Employed a ratio of signal differences and sums from receiving parts to normalize reflectivity variations.
Main Results:
- The sensor's performance was demonstrated to be independent of target reflectivity across three different targets.
- Geometric analysis determined the working distance based on fiber arrangement.
- Experimental results validated the theoretical predictions of reflectivity independence.
Conclusions:
- The novel optical-fiber displacement sensor effectively eliminates sensitivity to target reflectivity.
- The sensor's design and geometric analysis provide a robust solution for displacement measurement.
- This technology has potential applications where consistent sensing performance is required.
