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Variable-Sensitivity Force Sensor Based on Structural Modification.

Kazuto Takashima¹, Kengo Ota¹, Hiroki Cho²

¹Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 808-0196, Japan.

Sensors (Basel, Switzerland)

|February 28, 2023

Summary

This study introduces a novel force sensor with adjustable sensitivity and measurement range. By altering its structure using shape-memory materials, the sensor overcomes the typical trade-off between range and sensitivity.

Keywords:

cantilever force sensor shape-memory alloy shape-memory polymer strain gauge variable sensitivity

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Area of Science:

Materials Science
Mechanical Engineering
Sensor Technology

Background:

Force sensors are crucial across various fields, but often face a trade-off between measurement range and sensitivity.
Existing force sensors have limitations in adapting to diverse operating environments requiring different performance characteristics.

Purpose of the Study:

To develop a force sensor with variable sensitivity and measurement range.
To utilize structural modification and shape-memory materials for adaptable sensor performance.

Main Methods:

Theoretical analysis of a force sensor design incorporating structural modification.
Fabrication of prototypes using shape-memory alloy and polymer plates with attached strain gauges.
Experimental validation of sensor performance by analyzing the relationship between applied force and detected strain.

Main Results:

Demonstrated that altering the sensor's structure (distance between application/detection points, cross-sectional area) modifies its performance.
Confirmed that bending the shape-memory material plates changes the force-strain relationship.
Successfully achieved variable sensitivity and measurement range through structural adjustments.

Conclusions:

The developed force sensor effectively overcomes the range-sensitivity trade-off.
Shape-memory materials enable easy and temperature-controlled structural modification for adaptable sensing.
The sensor design shows promise for applications requiring flexible force measurement capabilities.