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

fYear

2007

fDate

28-31 Oct. 2007

Firstpage

193

Lastpage

196

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensors, 2007 IEEE

Conference_Location

Atlanta, GA

ISSN

1930-0395

Print_ISBN

978-1-4244-1261-7

Electronic_ISBN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2007.4388369

Filename

4388369