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An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement.

Suhana Jamil Ahamed1,2, Michael Aaron McGeehan1, Keat Ghee Ong1

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

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Summary
This summary is machine-generated.

A new optoelectronic sensor precisely measures rotational and linear motion between surfaces using reflected light. This technology can detect slippage in footwear and medical devices, aiding in managing conditions like diabetic neuropathy.

Keywords:
footwearlinear displacementoptical sensororthoticprosthesisrotational displacementshear

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Area of Science:

  • Optoelectronics
  • Sensor Technology
  • Biomedical Engineering

Background:

  • Accurate measurement of in-plane displacements is crucial for monitoring device performance and patient conditions.
  • Existing methods may lack the precision or applicability for dynamic, real-world scenarios in wearables.

Purpose of the Study:

  • To develop and validate an optoelectronic sensor for quantifying linear and rotational displacements between parallel surfaces.
  • To assess the sensor's accuracy using different color gradient wheels and its potential in wearable applications.

Main Methods:

  • Utilized a photo detector to measure reflected Red, Green, Blue, and Clear light intensities from a color gradient wheel.
  • Employed a polynomial regression algorithm trained and validated with data from a custom positioning stage.
  • Evaluated sensor reliability with wheels featuring changing hue and hue-and-saturation.

Main Results:

  • Achieved high predictive accuracy for linear and rotational motion detection.
  • Coefficients of determination (R^2) exceeded 0.94 for hue-only and 0.92 for hue-and-saturation wheels.
  • Demonstrated sensor's capability to quantify displacements under varying color conditions.

Conclusions:

  • The developed optoelectronic sensor accurately quantifies in-plane displacements and rotation.
  • Potential applications include detecting slippage in footwear, orthotics, and prosthetics.
  • This technology can aid in managing clinical conditions affecting gait and foot health.