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Three-core fiber Bragg grating probe force estimation model for micromanipulation applications.

Xinjian Li1, Zhiyuan Yao1, Hao Xu1

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This study introduces a novel three-core fiber Bragg grating (FBG) probe for precise sub-millinewton contact force measurement in micromanipulators. The FBG probe demonstrates excellent linearity and sensitivity for radial force detection.

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Area of Science:

  • Photonics and Optical Sensing
  • Micro-robotics and Precision Engineering
  • Materials Science and Engineering

Background:

  • Micromanipulators require highly sensitive force sensors for delicate operations.
  • Existing force sensors often lack the required precision for sub-millinewton measurements.
  • Fiber Bragg gratings (FBGs) offer potential for miniaturized and robust sensing solutions.

Purpose of the Study:

  • To develop and characterize a novel three-core fiber Bragg grating (FBG) probe for sub-millinewton contact force measurement.
  • To evaluate the probe's performance in measuring radial forces within a micromanipulator system.
  • To compare the proposed three-core FBG probe with existing structures.

Main Methods:

  • Fabrication of a three-core fiber Bragg grating (FBG) probe using capillary self-assembly.
  • Theoretical modeling of Bragg wavelength shifts under applied force based on material mechanics.
  • Experimental validation of the probe's response to radial contact forces (0.1-1 mN).

Main Results:

  • The three-core FBG probe exhibits a strong linear relationship between Bragg wavelength and radial contact force.
  • The probe successfully measures radial contact forces in the sub-millinewton range (0.1-1 mN).
  • The developed probe demonstrates superior forming stability and sensitivity compared to four-core structures.

Conclusions:

  • The proposed three-core FBG probe is a viable solution for high-precision sub-millinewton contact force sensing.
  • The probe's simple structure, low cost, and enhanced performance make it suitable for micromanipulator applications.
  • This FBG-based sensor advances the capabilities of force feedback in micro-scale manipulation.