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1. (WO2015047740) COMPOSITIONS, APPARATUS AND METHODS FOR CAPACITIVE TEMPERATURE SENSING

Pub. No.:    WO/2015/047740    International Application No.:    PCT/US2014/055182
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Fri Sep 12 01:59:59 CEST 2014
IPC: G01K 7/34
G01K 7/36
G01K 13/00
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: GHOSH, Dipankar
KANG, Myungchan
KIM, Jaewon
Title: COMPOSITIONS, APPARATUS AND METHODS FOR CAPACITIVE TEMPERATURE SENSING
Abstract:
A passive temperature-sensing apparatus, which includes a capacitive sensing element that includes a capacitive sensing composition that includes a ferroelectric ceramic material that exhibits a measurable electrical Curie temperature that is below 30 degrees C. The capacitive sensing composition exhibits a negative slope of capacitance versus temperature over the temperature range of from 30 degrees C to 150 degrees C.