Additively manufactured micro-lattice dielectrics for multiaxial capacitive sensors

Area of Science:

• Materials Science
• Robotics
• Biomedical Engineering

Background:

• Soft sensors capable of detecting multiaxial forces (normal and shear) are crucial for advanced robotic manipulation and human performance analysis.
• Traditional planar fabrication methods limit the complexity and functionality of soft sensors, often requiring multi-step production processes.

Purpose of the Study:

• To develop a novel additive manufacturing approach for creating high-resolution, 3D elastomeric lattices for soft capacitive sensors.
• To demonstrate the tunability of sensor performance through design parameters and explore their integration into functional devices.

Main Methods:

• Utilized continuous liquid interface production (CLIP), an additive manufacturing technique, to fabricate 3D elastomeric polyurethane lattices with 30-micrometer resolution.
• Employed microcomputed tomography (micro-CT) and finite element analysis (FEA) to analyze lattice deformation and sensing mechanisms.
• Designed and printed integrated sensors within representative athletic equipment.

Main Results:

• Successfully created high-resolution (30-micrometer) 3D elastomeric polyurethane lattices for capacitive sensor dielectric layers.
• Demonstrated that sensor capacitive responses and sensitivities are highly tunable by adjusting lattice design, thickness, and material-void volume.
• Validated the influence of lattice design on deformation and sensing behavior through micro-CT and FEA.
• Showcased the practical application of 3D printing by producing athletic equipment with integrated soft sensors.

Conclusions:

• Additive manufacturing, specifically CLIP, enables the fabrication of complex 3D lattice structures for advanced soft sensor applications.
• The developed soft sensors offer tunable performance, making them suitable for dexterous robotics and human performance monitoring.
• 3D printing provides a versatile platform for integrating sophisticated sensing capabilities into various equipment.