Displacement Measurement Method Based on Double-Arrowhead Auxetic Tubular Structure

Area of Science:

• Materials Science
• Mechanical Engineering
• Sensor Technology

Background:

• Traditional displacement sensors can be complex and costly.
• There is a need for accessible and flexible displacement measurement solutions.

Purpose of the Study:

• To introduce an innovative displacement measurement technique utilizing auxetic tubular structures (ATS).
• To demonstrate the feasibility and effectiveness of ATS for accurate displacement sensing.

Main Methods:

• Utilizing tubular structures with a negative Poisson's ratio (auxetic properties).
• Leveraging the change in light transmittance through ATS during elastic deformation.
• Converting light transmittance variations into output voltage changes using a solar cell.
• Employing 3D-printing for ATS fabrication.

Main Results:

• The proposed method achieves a linear error of less than 8% without signal processing.
• Sensitivity of 0.011 V/mm was recorded without signal amplification.
• Demonstrated good repeatability, reliability, and sensitivity across different measurement devices.

Conclusions:

• The auxetic tubular structure (ATS) offers a feasible and effective method for displacement measurement.
• 3D-printing enhances the accessibility and design flexibility of ATS displacement sensors.
• The system exhibits a favorable linear relationship, acceptable sensitivity, repeatability, and reliability.