An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement
We developed an optoelectronic sensor capable of quantifying in-plane rotational and linear displacements between two parallel surfaces. The sensor utilizes a photo detector to capture the intensity of red (R), green (G), blue (B), and clear (C, broad visible spectrum) light reflected from a color g...
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MDPI AG
2025-06-01
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| Online Access: | https://www.mdpi.com/1424-8220/25/13/3996 |
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| author | Suhana Jamil Ahamed Michael Aaron McGeehan Keat Ghee Ong |
| author_facet | Suhana Jamil Ahamed Michael Aaron McGeehan Keat Ghee Ong |
| author_sort | Suhana Jamil Ahamed |
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| description | We developed an optoelectronic sensor capable of quantifying in-plane rotational and linear displacements between two parallel surfaces. The sensor utilizes a photo detector to capture the intensity of red (R), green (G), blue (B), and clear (C, broad visible spectrum) light reflected from a color gradient wheel on the opposing surface. Variations in reflected R, G, B and C light intensities, caused by displacements, were used to predict linear and rotational motion via a polynomial regression algorithm. To train and validate this model, we employed a custom-built positioning stage that produced controlled displacement and rotation while recording corresponding changes in light intensity. The reliability of the predicted linear and rotational displacement results was evaluated using two different color gradient wheels: a wheel with changing color hue, and another wheel with changing color hue and saturation. Benchtop experiments demonstrated high predictive accuracy, with coefficients of determination (<i>R</i><sup>2</sup>) exceeding 0.94 for the hue-only wheel and 0.92 for the hue-and-saturation wheel. These results highlight the sensor’s potential for detecting shear displacement and rotation in footwear and wearable medical devices, such as orthotics and prostheses, enabling the detection of slippage, overfitting, or underfitting. This capability is particularly relevant to clinical conditions, including diabetic neuropathy, flat feet, and limb amputations. |
| format | Article |
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| institution | Matheson Library |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj-art-bd9e6f9a9cbb4cedb3dd25b6b3e6e57c2025-07-11T14:43:06ZengMDPI AGSensors1424-82202025-06-012513399610.3390/s25133996An Optical Sensor for Measuring In-Plane Linear and Rotational DisplacementSuhana Jamil Ahamed0Michael Aaron McGeehan1Keat Ghee Ong2Department of Bioengineering, Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USADepartment of Bioengineering, Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USADepartment of Bioengineering, Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USAWe developed an optoelectronic sensor capable of quantifying in-plane rotational and linear displacements between two parallel surfaces. The sensor utilizes a photo detector to capture the intensity of red (R), green (G), blue (B), and clear (C, broad visible spectrum) light reflected from a color gradient wheel on the opposing surface. Variations in reflected R, G, B and C light intensities, caused by displacements, were used to predict linear and rotational motion via a polynomial regression algorithm. To train and validate this model, we employed a custom-built positioning stage that produced controlled displacement and rotation while recording corresponding changes in light intensity. The reliability of the predicted linear and rotational displacement results was evaluated using two different color gradient wheels: a wheel with changing color hue, and another wheel with changing color hue and saturation. Benchtop experiments demonstrated high predictive accuracy, with coefficients of determination (<i>R</i><sup>2</sup>) exceeding 0.94 for the hue-only wheel and 0.92 for the hue-and-saturation wheel. These results highlight the sensor’s potential for detecting shear displacement and rotation in footwear and wearable medical devices, such as orthotics and prostheses, enabling the detection of slippage, overfitting, or underfitting. This capability is particularly relevant to clinical conditions, including diabetic neuropathy, flat feet, and limb amputations.https://www.mdpi.com/1424-8220/25/13/3996optical sensorshearlinear displacementrotational displacementorthoticprosthesis |
| spellingShingle | Suhana Jamil Ahamed Michael Aaron McGeehan Keat Ghee Ong An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement Sensors optical sensor shear linear displacement rotational displacement orthotic prosthesis |
| title | An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement |
| title_full | An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement |
| title_fullStr | An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement |
| title_full_unstemmed | An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement |
| title_short | An Optical Sensor for Measuring In-Plane Linear and Rotational Displacement |
| title_sort | optical sensor for measuring in plane linear and rotational displacement |
| topic | optical sensor shear linear displacement rotational displacement orthotic prosthesis |
| url | https://www.mdpi.com/1424-8220/25/13/3996 |
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