Thermal electrical analysis of serpentine shaped sensing element geometries to enhance the responsivity of thermoresistive sensor

Wei-Chih Wang; Abhishek Gupta

doi:10.1117/12.2516380

1 April 2019 Thermal electrical analysis of serpentine shaped sensing element geometries to enhance the responsivity of thermoresistive sensor

Wei-Chih Wang, Abhishek Gupta

Author Affiliations +

Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 109721W (2019) https://doi.org/10.1117/12.2516380
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States

Abstract

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.

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Wei-Chih Wang and Abhishek Gupta "Thermal electrical analysis of serpentine shaped sensing element geometries to enhance the responsivity of thermoresistive sensor", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721W (1 April 2019); https://doi.org/10.1117/12.2516380

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KEYWORDS

Resistance

Temperature metrology

Sensors

Radiative energy transfer

Thermal sensing

Microbolometers

Bolometers

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