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Open AccessArticle

Optimization of SAW Devices with LGS/Pt Structure for Sensing Temperature

1
Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
2
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(9), 2441; https://doi.org/10.3390/s20092441
Received: 21 March 2020 / Revised: 2 April 2020 / Accepted: 23 April 2020 / Published: 25 April 2020
(This article belongs to the Section Physical Sensors)
Research has shown that SAW (surface acoustic wave) devices with an LGS/Pt (langasite La3Ga5SiO14/platinum) structure are useful in high-temperature sensor applications. Extreme high temperature brings great acoustic attenuation because of the thermal radiation loss, which requires that the sensing device offer a sufficiently high quality factor (Q) and a low loss. Therefore, it is necessary to improve the performance of the quality factor as much as possible so as to better meet the application of high-temperature sensors. Based on these reasons, the main work of this paper was to extract accurate simulation parameters to optimize the Pt/LGS device and obtain Q-value device parameters. Optimization of SAW devices with LGS/Pt structure for sensing extreme high temperature was addressed by employing a typical coupling of modes (COM) model in this work. Using the short pulse method, the reflection coefficient of Pt electrodes on LGS substrate was extracted accurately by characterizing the prepared SAW device with strategic design. Other relevant parameters for COM simulation were determined by finite element analysis. To determine the optimal design parameters, the COM simulation was conducted on the SAW sensing device with a one-port resonator pattern for sensing extreme temperature, which allows for a larger Q-value and low insertion loss. Experimental results validate the theoretical simulation. In addition, the corresponding high-temperature characteristics of the prepared sensing device were investigated. View Full-Text
Keywords: surface acoustic wave; Pt/LGS; short pulse method; high-temperature sensor; COM model surface acoustic wave; Pt/LGS; short pulse method; high-temperature sensor; COM model
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MDPI and ACS Style

Li, X.; Wang, W.; Fan, S.; Yin, Y.; Jia, Y.; Liang, Y.; Liu, M. Optimization of SAW Devices with LGS/Pt Structure for Sensing Temperature. Sensors 2020, 20, 2441. https://doi.org/10.3390/s20092441

AMA Style

Li X, Wang W, Fan S, Yin Y, Jia Y, Liang Y, Liu M. Optimization of SAW Devices with LGS/Pt Structure for Sensing Temperature. Sensors. 2020; 20(9):2441. https://doi.org/10.3390/s20092441

Chicago/Turabian Style

Li, Xueling; Wang, Wen; Fan, Shuyao; Yin, Yining; Jia, Yana; Liang, Yong; Liu, Mengwei. 2020. "Optimization of SAW Devices with LGS/Pt Structure for Sensing Temperature" Sensors 20, no. 9: 2441. https://doi.org/10.3390/s20092441

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