Abstract
The present invention discloses a gas-analyte sensor and method thereof, particularly can sense at least one analyte(s) at the same time in a low consistency environment. The sensor includes a first surface acoustic wave (SAW) device which includes a piezoelectric substrate, a pair of transducers and an external circuit. The pair of transducers consists of a first transducer and a second transducer, and they are respectively formed at two sides of said piezoelectric substrate. The first transducer is utilized to convert between electric energy and mechanical energy so as to generate surface acoustic wave on the piezoelectric substrate. The external circuit electrically connects to the pair of the transducers. Further, at least one second surface acoustic wave (SAW) device(s) which includes a first SAW device and a sensing thin film (with holes) which is formed above said pair of the transducers. A control device is responsive to only one of the external circuits at each time. When analyte is absorbed on the thin film, then it transmits the signal of the SAW to the second transducer, so as to obtain quantitative or qualitative analysis of the analyte through the changes of the SAW.