Edema-detecting wearable devices
The goal(s): The goal of this project is to design wearable sensing systems that can monitor the progression of edema.
The why(s): Persistent peripheral edema (tissue swelling) can affect quality of life. Devices that warn of edema progression (or improvement!) would assist clinicians and patients in understanding treatment.
Shown right is a photograph of an early prototype to measure upper-arm swelling during exercise.
Origami-patterned sensors and actuators
The goals: Investigate origami properties of soft materials, determine tunability of origami patterned soft-material sensors, and apply to origami actuators for proprioception and control
The whys: Origami patterns have novel metamaterial properties, including negative Poisson’s ratio (expansion in both in-plane directions), that may be applicable to making mechanical sensors with tuned or selective properties. Deployable soft origami actuators will also benefit from sensors on the origami faces.
Shown left is a Miura-patterned capacitive sensor. The pattern angle controls the initial strain sensitivity changes, where a flatter sensor is more sensitive .
Supported by NSF CAREER, 1846954, 02/01/2019-01/13/2024
K.L. Dorsey, H. Huang, and Y. Wen, “Origami-patterned capacitor with programmed strain sensitivity,” Multifunctional Materials, vol. 5, no. 2, 2022
Tactile Sensing with Mechanical Switch Structure
The goal of this proposal is to improve grasping and manipulation quality in soft actuators through tactile sensors with faster responses. We propose a novel buckled beam sensor to deliver tunable and fast tactile sensing across a range of applied force.
Supported by a research gift from Amazon Robotics
DefeXtiles: 3D printed fabrics for wearable actuators and sensors
In collaboration with the Tangible Media Group at MIT.
The goal(s): Fabricate textile-like devices, sensors, and actuators in a tabletop additive manufacturing process (fused deposition modeling)
The why(s): Access to rapid prototyping tools is expanding with neighborhood maker spaces, but many tools used to prototype wearable devices and e-textiles are expensive and/or require extensive training. This project envisions bringing active and e-textile capabilities to users in their homes, which will expand access and control over wearable design.
Shown right is a flat DefeXtile sample made from PLA that is being twisted to illustrate its flexibility.
Publications: K.L. Dorsey, S.F. Roberts, J. Forman, and H. Ishii, “Analysis of DefeXtiles: A 3D printed textile,” J. Micromech. Microeng., 2022.
Supported by the MIT MLK Visiting Scholars program
Selective contact in anisotropic resistive sensors (SCARS) Sleeve
In collaboration with the Harvard Microrobotics Lab.
The goal(s): Design selective electrical contact sensors to select for strain over torsion, curvature, or pressure and demonstrate a sensing sleeve with the ability to identify hand gestures.
The why(s): When interacting or collaborating with machines, gestures are a natural way to convey information. This sleeve identifies three gestures without encumbering the hand with a glove.
Publications: O.A. Araromi, M.A. Graule, K.L. Dorsey, S. Castellanos, J.R. Foster, W.H. Hsu, J.J. Vlassak, W.H. Hsu, A.E. Passy, J.J. Vlassak, J.C. Weaver, C.J. Walsh, R.J. Wood, “Ultra-sensitive and resilient compliant strain gauges for soft machines,” Nature, no. 587, pp. 219–224, 2020.