Back to results
US 12,281,948 B2Granted
Negative Poisson ratio piezoresistive sensor and method of manufacture
AssigneeThe Florida State University Research Foundation, Inc.
InventorsChangchun Zeng, Zhiyong Liang, Yan Li, Sida Luo, Tao Liu
Life of this patent
Estimating the term…
Abstract
The present invention includes scalable and cost-effective auxetic foam sensors (AFS) created through conformably coating a thin conductive nanomaterial-sensing layer on a porous substrate having a negative Poisson's ratio. In general, the auxetic foam sensors possess multimodal sensing capability, such as large deformation sensing, small pressure sensing, shear/torsion sensing and vibration sensing and excellent robustness in humidity environment.
Claims19
An auxetic foam sensor consisting of comprising:
- a porous substrate comprising auxetic foam and having a tunable negative Poisson ratio;
- and
- a piezoresistive coating on a surface of the porous substrate, wherein:
- a piezoresistive sensitivity of the auxetic foam sensor increases as the Poisson ratio of the porous substrate decreases,
- a gauge factor (GF) of the auxetic foam sensor under tensile strain relative to under compressive strain is variable by tuning the Poisson ratio to provide superimposed and amplified tunneling resistance, and
- the auxetic foam sensor is configured to provide quantifiable piezoresistive measurements corresponding with a timing, frequency, and magnitude of an applied force to the surface of the auxetic foam sensor in a plurality of deformation modes.
3 more elements
A wearable device comprising:
- an auxetic foam sensor, the auxetic foam sensor consisting of comprising:
- a porous substrate comprising auxetic foam and having a tunable negative Poisson ratio;
- and
- a piezoresistive coating on a surface of the porous substrate, wherein:
- a piezoresistive sensitivity of the auxetic foam sensor increases as the Poisson ratio of the porous substrate decreases,
- a gauge factor (GF) of the auxetic foam sensor under tensile strain relative to under compressive strain is variable by tuning the Poisson ratio to provide superimposed and amplified tunneling resistance, and
- the auxetic foam sensor is configured to provide quantifiable piezoresistive measurements corresponding with a timing, frequency, and magnitude of an applied force to the surface of the auxetic foam sensor in a plurality of deformation modes.
4 more elements
Dependencies are inferred from the claim text.