Piezoelectric shear wave resonator and method of making same

1989 ◽  
Vol 85 (2) ◽  
pp. 983-983
Author(s):  
Jin S. Wang ◽  
Kenneth M. Lakin ◽  
Allen R. Landin
Keyword(s):  
Shear Wave ◽  
Wave Resonator

Multilayered shear wave resonator consisting of c-axis tilted ZnO films

2009 ◽  
Author(s):  
Naoki Morisato ◽  
Shinji Takayanagi ◽  
Takahiko Yanagitani ◽  
Mami Matsukawa ◽  
Yoshiaki Watanabe
Keyword(s):  
Shear Wave ◽  
Zno Films ◽  
Wave Resonator

Nonlinear shear wave resonator consisting of a relaxing material

2017 ◽  
Vol 142 (4) ◽  
pp. 2723-2723 ◽  
Author(s):  
John M. Cormack ◽  
Mark F. Hamilton
Keyword(s):  
Shear Wave ◽  
Wave Resonator ◽  
Nonlinear Shear

scholarly journals Solidly Mounted Longitudinally Excited Shear Wave Resonator (YBAR) Based on Lithium Niobate Thin-Film

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1039
Author(s):  
Zhen-Hui Qin ◽  
Shu-Mao Wu ◽  
Yong Wang ◽  
Kang-Fu Liu ◽  
Tao Wu ◽  
...  
Keyword(s):  
Shear Wave ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Low Cost ◽  
Electromechanical Coupling Coefficient ◽  
Platinum Electrodes ◽  
Temperature Drift ◽  
Large Bandwidth ◽  
Wave Resonator ◽  
5 Ghz

This paper proposed a solid-mounted (SM) longitudinally excited shear wave resonator (i.e., YBAR). By adopting a 200 nm x-cut LiNbO3 film, top (aluminum) and bottom (platinum) electrodes in 50 nm thickness and 500 nm width, this resonator simultaneously achieves an operating frequency over 5 GHz with an electromechanical coupling coefficient exceeding 50%. Compared with previously proposed YBAR with suspended structure, the proposed SM-YBAR can effectively suppress unwanted spurious modes with only a slight loss of the electromechanical coupling coefficient. The SM-YABR also provides better device stability, possible low-temperature drift coefficient, and a more convenient and mature device processing. It has the potential to meet the multiple requirements for the next generation signal processing devices in terms of high frequency, large bandwidth, stability, and low cost, etc.

Liver Elastography in Healthy Children Using Three Different Systems – How Many Measurements Are Necessary?

2020 ◽  
Author(s):  
Anders Batman Mjelle ◽  
Anesa Mulabecirovic ◽  
Roald Flesland Havre ◽  
Edda Jonina Olafsdottir ◽  
Odd Helge Gilja ◽  
...  
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Intraclass Correlation ◽  
Age Groups ◽  
Liver Stiffness ◽  
Shear Wave Elastography ◽  
Healthy Children ◽  
Significant Difference ◽  
Pediatric Liver Disease ◽  
Liver Elastography

Abstract Purpose Liver elastography is increasingly being applied in screening for and follow-up of pediatric liver disease, and has been shown to correlate well with fibrosis staging through liver biopsy. Because time is of the essence when examining children, we wanted to evaluate if a reliable result can be achieved with fewer acquisitions. Materials and Methods 243 healthy children aged 4–17 years were examined after three hours of fasting. Participants were divided into four age groups: 4–7 years; 8–11 years; 12–14 years and 15–17 years. Both two-dimensional shear wave elastography (2D-SWE; GE Logiq E9) and point shear wave elastography (pSWE; Samsung RS80A with Prestige) were performed in all participants, while transient elastography (TE, Fibroscan) was performed in a subset of 87 children aged 8–17 years. Median liver stiffness measurement (LSM) values of 3, 4, 5, 6, 7, and 8 acquisitions were compared with the median value of 10 acquisitions (reference standard). Comparison was performed for all participants together as well as within every specific age group. We investigated both the intraclass correlation coefficient (ICC) with absolute agreement and all outliers more than 10 %, 20 % or ≥ 0.5 or 1.0 kPa from the median of 10 acquisitions. Results For all three systems there was no significant difference between three and ten acquisitions, with ICCs ≥ 0.97. All systems needed 4 acquisitions to achieve no LSM deviating ≥ 1.0 kPa of a median of ten. To achieve no LSM deviating ≥ 20 % of a median of ten acquisitions, pSWE and TE needed 4 acquisitions, while 2D-SWE required 6 acquisitions. Conclusion Our results contradict recommendations of 10 acquisitions for pSWE and TE and only 3 for 2D-SWE.

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