Title :
Low-Cost Capacitive Humidity Sensor for Application Within Flexible RFID Labels Based on Microcontroller Systems
Author :
Pelegrí-Sebastiá, José ; García-Breijo, Eduardo ; Ibanez, J. ; Sogorb, Tomas ; Laguarda-Miro, Nicolís ; Garrigues, Josí
Author_Institution :
Inst. de Investig. para la Gestion Integrada de Zonas Costeras, Univ. Politec. de Valencia, Grao de Gandia, Spain
Abstract :
This paper reports on the fabrication of a capacitive-type relative humidity (RH) sensor using screen printing processes for electrode film deposition. The applied measurement method based on microcontrollers is also reported. In this specific case, the microcontroller is used to measure RH by means of a capacitive sensor with a simple low-cost electronic system. In addition, a comparison between two different types of polyester substrates [Melinex (DuPont) and CG3460 (3M)] is shown. Both polyester substrates have similar properties, and only the thickness is different (175 μm for Melinex and 100 μm for CG3460). A nonlineal response has been obtained in this type of sensors. In order to linearize the response and reduce the external hardware, an artificial neural network embedded into the microcontroller has been used.
Keywords :
capacitive sensors; computerised instrumentation; electrodeposits; humidity sensors; microcontrollers; neural nets; radiofrequency identification; RH sensor; artificial neural network; electrode film deposition; external hardware; flexible RFID label; low-cost capacitive humidity sensor; low-cost electronic system; microcontroller; polyester substrates; screen printing processes; size 100 mum; size 175 mum; Capacitance; Humidity; Ink; Microcontrollers; Printing; Radiofrequency identification; Substrates; Artificial neural network (ANN); capacitive-type sensor; humidity sensor; microcontroller; radio frequency identification (RFID) label; screen printing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2011.2164860
