A textile integrated sensor system for monitoring humidity and temperature

We report on the fabrication of a temperature and a humidity sensor for the integration into a smart textile as sensing device that monitors the room climate. For this purpose, we developed a sensor system on flexible polyimide substrates containing a gold resistance temperature sensor (RTDs) and conductive polymer (PEDOT-PSS) humidity sensor. The sensor is woven into a textile using a commercial band weaving machine. The measured resistance versus temperature shows a linear response with a temperature coefficient of 0.0028 °C−1. The measured resistance versus humidity for the PEDOT sensors shows a non-linear distribution over the range from 30 to 80 % RH. We successfully tested the devices in a controlled environment at 20 °C and 30–50 %RH. Both sensors show their potential for environmental monitoring of the room climate as integrated sensors in textiles.

[1]  Bert Brunekreef,et al.  Health and Indoor Climate Complaints of 7043 office Workers in 61 Buildings in the Netherlands , 1992 .

[2]  Christine Kallmayer,et al.  Embroidered Interconnections and Encapsulation for Electronics in Textiles for Wearable Electronics Applications , 2008 .

[3]  Christoph Zysset,et al.  Woven Thin-Film Metal Interconnects , 2010, IEEE Electron Device Letters.

[4]  P. Wilson,et al.  Development of electronic textiles to support networks, communications, and medical applications in future U.S. Military protective clothing systems , 2005, IEEE Transactions on Information Technology in Biomedicine.

[5]  Y. Lin.  Hysteresis-type current-voltage characteristics of indium tin oxide/poly (3,4-ethylenedioxythiophene) doped with poly (4-styrenesulfonate)/indium tin oxide devices , 2008 .

[6]  G. Tröster,et al.  Woven Electronic Fibers with Sensing and Display Functions for Smart Textiles , 2010, Advanced materials.

[7]  Kunigunde Cherenack,et al.  Development and evaluation of temperature sensors for textile integration , 2009, 2009 IEEE Sensors.

[8]  Geert Langereis,et al.  Contactless EMG sensors embroidered onto textile , 2007, BSN.

[9]  G. Tröster,et al.  Woven Electronic Textiles: An Enabling Technology for Health-care Monitoring in Clothing , 2010 .

[10]  Guy Voirin,et al.  Wearable Biosensors for Monitoring Wound Healing , 2008 .

[11]  Z. Suo,et al.  Mechanics of rollable and foldable film-on-foil electronics , 1999 .

[12]  Salih Okur,et al.  Electrical characterization of PEDOT:PSS beyond humidity saturation , 2009 .

[13]  Gerhard Tröster,et al.  Weaving integrated circuits into textiles , 2010, International Symposium on Wearable Computers (ISWC) 2010.

[14]  Gerhard Tröster,et al.  SMASH: a distributed sensing and processing garment for the classification of upper body postures , 2008, BODYNETS.