An Optoelectronics-Based Compressive Force Sensor with Scalable Sensitivity
Author:
Pennel Zachary12, McGeehan Michael1ORCID, Ong Keat Ghee1ORCID
Affiliation:
1. Department of Bioengineering, Knight Campus for Accelerating Scientific Impact, University of Oregon, Eugene, OR 97403, USA 2. Department of Physics, University of Oregon, Eugene, OR 97403, USA
Abstract
There is an increasing need to accurately measure compressive force for biomedical and industrial applications. However, this need has not been fully addressed, as many sensors are bulky, have high power requirements, and/or are susceptible to electromagnetic interference. This paper presents an optoelectronics-based force sensor that can overcome the limitations of many sensors in the market. The sensor uses a light emitting diode (LED) to transmit visible broad-spectrum light into a photoresistor through an optically clear spacer on top of an elastomeric medium. In the absence of an external force, the light path is mostly blocked by the opaque elastomeric medium. Under a compressive force, the clear spacer compresses the elastomer, moving itself into the light path, and thus increasing the overall light transmission. The amount of light received by the photoresistor is used to quantify compressive force based on elastomer displacement/compression and a priori knowledge of elastomer stiffness. This sensing scheme was tested under eight different configurations: two different sized sensors with four types of elastomers per size (20A neoprene, 30A neoprene, 50A neoprene, and 75A styrene–butadiene rubber (SBR)). All configurations measured force with R2 > 0.97, RMSE < 1.9 N, and sensitivity values ranging from 17 to 485 N/V. This sensing scheme provides a low-cost, low-power method for accurate force sensing with a wide force range.
Funder
Wu Tsai Human Performance Alliance Joe and Clara Tsai Foundation, Office of Vice President for Research and Innovation Knight Campus Undergraduate Scholars Program funded by Ken and Kenda Singer
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference39 articles.
1. Common Sensors in Industrial Robots: A Review;Li;J. Phys. Conf. Ser.,2019 2. A Review on 3D printed force sensors;Choudhary;IOP Conf. Ser. Mater. Sci. Eng.,2021 3. Zhao, Y., Liu, Y., Li, Y., and Hao, Q. (2020). Development and Application of Resistance Strain Force Sensors. Sensors, 20. 4. Krouglicof, N., Alonso, L.M., and Keat, W.D. (2004, January 10–13). Development of a mechanically coupled, six degree-of-freedom load platform for biomechanics and sports medicine. Proceedings of the 2004 IEEE International Conference on Systems, Man and Cybernetics (IEEE Cat. No.04CH37583), The Hague, The Netherlands. 5. Force sensor clip for orthopedic applications;Nolten;Procedia Eng.,2010
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