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An Optoelectronics-Based Compressive Force Sensor with Scalable Sensitivity.

Zachary Pennel1,2, Michael McGeehan1, Keat Ghee Ong1

  • 1Department of Bioengineering, Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USA.

Sensors (Basel, Switzerland)
|July 29, 2023
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Summary
This summary is machine-generated.

This study introduces a novel optoelectronics-based force sensor using an LED and photoresistor. The low-cost, low-power sensor accurately measures compressive force for various applications.

Keywords:
compressive forceelastomeric characterizationoptical sensors

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Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Materials Science

Background:

  • Accurate compressive force measurement is critical for biomedical and industrial uses.
  • Existing sensors often suffer from bulkiness, high power consumption, and electromagnetic interference.
  • There is a need for improved force sensing solutions.

Purpose of the Study:

  • To develop and validate an optoelectronics-based force sensor.
  • To overcome the limitations of conventional force sensors.
  • To provide a low-cost, low-power, and accurate force sensing method.

Main Methods:

  • Utilized a light emitting diode (LED) to transmit light through an optically clear spacer and an elastomeric medium.
  • Measured changes in light transmission to a photoresistor as a function of applied compressive force.
  • Tested sensor performance with two sizes and four types of elastomers (neoprene and SBR).

Main Results:

  • Achieved high accuracy with R-squared values greater than 0.97 across all tested configurations.
  • Demonstrated low root-mean-square error (RMSE) below 1.9 N.
  • Reported sensitivity values ranging from 17 to 485 N/V, indicating a wide force measurement range.

Conclusions:

  • The developed optoelectronics-based sensor offers an accurate and reliable method for compressive force measurement.
  • This sensing scheme presents a cost-effective and energy-efficient alternative to existing technologies.
  • The sensor's performance across various configurations highlights its versatility for diverse applications.