US 12,281,948 B2
Negative Poisson ratio piezoresistive sensor and method of manufacture
Changchun Zeng, Tallahassee, FL (US); Zhiyong Liang, Tallahassee, FL (US); Yan Li, Tallahassee, FL (US); Sida Luo, Tallahassee, FL (US); and Tao Liu, Tallahassee, FL (US)
Assigned to The Florida State University Research Foundation, Inc., Tallahassee, FL (US)
Filed by The Florida State University Research Foundation, Inc., Tallahassee, FL (US)
Filed on Oct. 11, 2023, as Appl. No. 18/484,893.
Application 16/439,146 is a division of application No. 15/803,400, filed on Nov. 3, 2017, granted, now 10,955,300, issued on Mar. 3, 2021.
Application 18/484,893 is a continuation of application No. 16/439,146, filed on Jun. 12, 2019, abandoned.
Application 15/803,400 is a continuation of application No. PCT/US2016/030716, filed on May 4, 2016.
Claims priority of provisional application 62/156,609, filed on May 4, 2015.
Prior Publication US 2024/0044728 A1, Feb. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G01L 1/18 (2006.01); B29C 44/34 (2006.01); B32B 37/24 (2006.01); B82Y 40/00 (2011.01); G01L 1/22 (2006.01); G01L 1/26 (2006.01); G01R 29/22 (2006.01); B05D 1/18 (2006.01)
CPC G01L 1/18 (2013.01) [B29C 44/357 (2013.01); B32B 37/24 (2013.01); B82Y 40/00 (2013.01); G01L 1/2287 (2013.01); G01L 1/26 (2013.01); G01R 29/22 (2013.01); B05D 1/18 (2013.01); B32B 2037/243 (2013.01)] 19 Claims
OG exemplary drawing
 
1. 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.