Title :
Development of a New Wireless Chemical Sensor for CO2 detection
Author :
Wang, Wen ; Kim, Taehyun ; Lee, Keekeun ; Oh, Haekwan ; Yang, Sangsik
Author_Institution :
Ajou Univ., Suwon
Abstract :
We developed a 440 MHz surface acoustic wave wireless gas senor for CO2 detection and wireless measurement system. The sensor consists of a SAW reflective delay line structured by single phase unidirectional transducers (SPUDTs) and three shorted grating reflectors, and a Teflon AF 2400 thin film sensitive to CO2 gas deposited onto substrate between reflectors. The fabricated SAW device was wirelessly characterized by network analyzer. Adsorption of CO2 gas onto the sensitive film induced a large phase shifts of the reflection peaks depending on the CO2 concentration. The obtained sensitivity was 1.987 ppm.
Keywords :
UHF devices; gas sensors; radio applications; surface acoustic wave sensors; CO2; SAW device; SAW reflective delay line; Teflon AF 2400 thin film; carbon dioxide detection; frequency 440 MHz; large phase shift; network analyzer; shorted grating reflector; single phase unidirectional transducers; surface acoustic wave wireless gas senor; wireless chemical sensor; Acoustic measurements; Acoustic sensors; Acoustic signal detection; Acoustic waves; Chemical sensors; Gas detectors; Sensor phenomena and characterization; Surface acoustic waves; Thin film sensors; Wireless sensor networks;
Conference_Titel :
Sensors, 2007 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1261-7
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2007.4388369
