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Updated: Jul 1, 2025
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
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Multi-wavelength confocal displacement sensing using a highly dispersive flat-field concave grating.
Applied Optics
|March 4, 2024
Summary
A novel multi-wavelength confocal displacement sensor utilizing a flat-field concave grating (FFCG) offers high precision and accuracy. This innovative sensor achieves a 6.8 mm displacement range with excellent linearity and sensitivity.
Area of Science:
- Optical Engineering
- Metrology
- Sensor Technology
Background:
- Traditional displacement sensors often rely on complex dispersive lens groups.
- Flat-field concave gratings (FFCGs) offer advantages in dispersion and size for optical systems.
Purpose of the Study:
- To propose and design a multi-wavelength confocal displacement sensor.
- To evaluate the performance characteristics of the FFCG-based sensor.
Main Methods:
- Design and construction of a multi-wavelength confocal displacement sensor incorporating an FFCG.
- Calibration using a displacement meter and measurement of sensor characteristics.
- Assessment of linearity, sensitivity, resolution, and stability.
Main Results:
- The sensor demonstrated a displacement range of 6.8 mm with an R-square linearity coefficient of 0.998.
- Sensitivity exceeded 17.1 nm/mm, with a resolution of 70 µm.
- High precision and accuracy were indicated by a full width at half maximum (FWHM) around 1.63 nm.
Conclusions:
- The FFCG-based displacement sensor is a viable alternative to complex lens systems.
- The developed sensor exhibits high precision, accuracy, stability, and reliability for displacement measurements.
