Backward Acoustic Waves in Piezoelectric Plates: Possible Application as Base for Liquid Sensors

被引:3
|
作者
Smirnov, Andrey [1 ]
Zaitsev, Boris [2 ]
Nedospasov, Ilya [1 ]
Nazarov, Gleb [1 ]
Kuznetsova, Iren [1 ]
机构
[1] Kotelnikov Inst Radio Engn & Elect RAS, Moscow 125009, Russia
[2] Kotelnikov Inst Radio Engn & Elect RAS, Saratov Branch, Saratov 410019, Russia
基金
俄罗斯科学基金会;
关键词
backward plate acoustic waves; detection; dispersion curves; interdigital transducer; contact with liquid; zero group velocity; NEGATIVE GROUP-VELOCITY; LAMB WAVES; GUIDED-WAVES; TRANSMISSION; PROPAGATION; CYLINDERS; EXISTENCE; SPECTRUM;
D O I
10.3390/s23020648
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Backward acoustic waves are characterized by oppositely directed phase and group velocities. These waves can exist in isotropic and piezoelectric plates. They can be detected using a set of interdigital transducers with different spatial periods located on the same piezoelectric substrate. In this paper, the effect of a nonviscous and nonconductive liquid on the characteristics of a first-order backward antisymmetric wave in a YX plate of lithium niobate is studied theoretically and experimentally. It is shown that the presence of liquid does not lead to the transformation or disappearance of this wave. It is shown that these waves are close to the cutoff frequency and are characterized by the presence of a point with zero group velocity. The design of a liquid sensor based on these waves is proposed.
引用
收藏
页数:12
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