This paper presents the result of simulations performed on absorber geometries of a thermoresistive sensor using ANSYS thermal electrical module. Four absorber geometries with different serpentine structures are used to test the percentage resistance change per unit temperature change. Thermoresistive material poly (3, 4- ethylenedioxythiophene): poly (4-styrenesulfonate) (PEDOT: PSS) with temperature dependent negative temperature coefficient of resistance is used to model the absorber geometry placed on a substrate of BK7 Glass. A heat source at a constant temperature of 36 OC is placed just above the face of the absorber and proper radiative heat transfer boundary conditions were applied, it is similar to bringing your finger closer to the sensor. Simulation results showedthat the percentage resistance change per unit temperature rise is indifferent of the geometrical shape. Calculation of view factor for radiation heat transfer conveys more absorbing area will have more amount of heat transfer and analytical formulation for calculating final temperature change shows its dependency on geometry i.e. a serpentine shaped geometry will have more temperature rise than a perfect square-shaped geometry having same fill factor.

Date Published: 1 April 2019
PDF: 7 pages
Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721W (1 April 2019); doi: 10.1117/12.2516380

Published in SPIE Proceedings Vol. 10972:
Health Monitoring of Structural and Biological Systems XIII
Paul Fromme; Zhongqing Su, Editor(s)