Flexible thin film temperature and strain sensor array utilizing a novel sensing concept

Flexible arrays of resistive temperature and strain sensors have been designed, and fabricated on polyimide sheets. We describe a novel sensor design concept, utilizing materials selection combined with specific device layout design, such that both temperature and strain values can be determined from resistance values of parallel sensor pairs, regardless of complex strain fields or temperature distribution. Fabrication of thin film Pt and NiCr resistive sensor arrays, with Cu conducting lines, on polyimide demonstrates the sensing concept. Temperature and strain sensing capabilities are demonstrated for temperatures up to 200 °C and up to 2% tensile strain.