Articles | Volume 9, issue 1
J. Sens. Sens. Syst., 9, 1–6, 2020

Special issue: Sensors and Measurement Systems 2019

J. Sens. Sens. Syst., 9, 1–6, 2020

Review paper 06 Jan 2020

Review paper | 06 Jan 2020

Modelling and model verification of an autonomous threshold sensor for humidity measurements

Nikolai Gulnizkij and Gerald Gerlach

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Cited articles

AMA: Sector Information: Quarter Reports 2017, available at:, last access: 14 August 2018.  
Arndt, K. F., Richter, A., Ludwig, S., Zimmermann, J., Kessler, J., Kuckling, D., and Adler, H. J.: Poly (vinyl alcohol)/poly (acrylic acid) hydrogels, FT-IR spectroscopic characterization of crosslinking reaction and work at transition point, Acta Polymerica, 50, 383–390, 1999. 
Bellmann, C.: Leistungslose Feuchteschwellwertschalter (Powerless Humidity Threshold Switch), Dissertation, TU Dresden, 2016. 
Bellmann, C., Steinke, A., Frank, T., and Gerlach, G.: Humidity micro switch based on humidity-sensitive polymers, Proc. SPIE 9430, Electroactive Polymer Actuators and Devices (EAPAD), 94302F, 2015. 
Chen, L. T., Lee, C. Y., and Cheng, W. H.: MEMS-based humidity sensor with integrated temperature compensation mechanism, Sensors and Actuat., 147, 522–528, 2008. 
Short summary
We describe a mechanical model based on the beam theory for the development of a beam-like sensor switch with switching hysteresis for humidity sensing. The hydrogel swelling provides the mechanical energy to deflect the partly hydrogel-covered bending beam via the bimorph effect. From the model, we calculate the deflection of a beam-like sensor switch with and without a switching hysteresis. A beam-like sensor switch was manufactured, and the switching hysteresis was successfully demonstrated.