Rume-Tze Tsai

I-Shou University, Kaohsiung, Kaohsiung, Taiwan

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Publications (3)1.95 Total impact

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    ABSTRACT: The simulation of wave propagation in periodic piezoelectric surface acoustic wave (SAW) structures was reported in this study. Firstly, space harmonics method (SHM) was used to analyze Rayleigh SAW propagation under a periodic Al grating. The results of SAW propagation analysis were applied to design a two-port resonator with Al grating on ST-cut quartz. The measured frequency response of the two-port resonator was approximately similar to the simulation one. Then, the chemical interface of polyaniline/WO3 composites was coated on the SAW resonator for ammonia detection. The SAW sensor responded to the ammonia gas and could be recovered using dry nitrogen. Detecting to 9.3ppm ammonia, the frequency shift was 5.9ppm, the noise level was 0.18ppm, and a signal-tonoise ratio was 32.8.
    12/2009: pages 293-302;
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    ABSTRACT: Surface acoustic wave (SAW) devices are key components for sensing applications. SAW propagation under a periodic grating was investigated in this work. The theoretical method used here is the space harmonic method. We also applied the results of SAW propagation studied in this work to design a two-port resonator with an Al grating on ST-cut quartz. The measured frequency responses of the resonator were similar to the simulation ones. Then, the chemical interface of polyaniline/WO(3) composites was coated on the SAW sensor for ammonia detection. The SAW sensor responded to ammonia gas and could be regenerated using dry nitrogen.
    Sensors 01/2009; 9(2):980-94. · 1.95 Impact Factor
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    ABSTRACT: The propagation characteristics of the surface acoustic waves (SAW) propagating under the periodic metal grating on ST-cut quartz substrates were theoretically investigated in order to achieve more accurate design of the devices. The theoretical method used here is based on Floquet's theorem using the space harmonics method (SHM) as an orthogonal function set. The boundary conditions are satisfied by solving the real boundary integral equations, which are derived from the method of weighted residuals for a period of each region, i.e., substrate, metal, and free space. The boundary integral equations are solved by using the Galerkin procedure. The periodic strip gratings are investigated, considering the convergence of the numerical computation for the number of the space harmonics. The dispersion properties for shorted and open gratings are derived from SHM. Finally, we can calculate the parameters of coupling of modes (COM) and design a resonator to prove the accuracy of propagation analysis.
    01/2008;