Printed wireless battery-free humidity sensor for integration into lightweight construction parts

This paper presents a fully printed wireless humidity sensor for structural health monitoring in smart lightweight construction parts. The sensor concept aims for sustainability and minimalism, fabricated by inkjet printing on uncoated paper substrate, working without the use of a battery or a chip. Measurement results show a wireless operation over a distance of 3mm, a sensitivity of 4.16 kHz per °C with a linear response and small hysteresis.