DEVELOPMENT OF NEW ULTRASONIC SENSORS UTILIZING EVANESCENT ACOUSTIC FIELDS
利用瞬逝声场开发新型超声波传感器
基本信息
- 批准号:18560324
- 负责人:
- 金额:$ 2.46万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2006
- 资助国家:日本
- 起止时间:2006 至 2007
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
1. Proximity sensing through the air-film damping effect caused by a longitudinal-mode piezoelectric vibrator has been studied. The vibrator is composed of a thin bar cut out from a 140° rotated Y-cut LiNbO_3 wafer having a glass plate on one end. The glass plate is approached to an acrylic plate served as a test object. It has been found for the vibrator operating at the first resonant frequency of 80.9 kHz that the Q-value decreases markedly from 8,000 to 1,000 in the range where the vibrator-to-object distance d is less than 0.5 mm.2. For the case of operation at the second mode having two nodal lines, the initial Q-value decreases to 3, 500. However, the vibrator can be supported more steadily than that in the case of the first mode operation. From these results, it has been confirmed that the proposed system utilizing the air-film damping effect can be applied for a proximity sensor.3. Trapped-energy mode thickness vibrators have been fabricated and applied for liquid level sensor … More s. When the surrounding region of the trapped-energy-mode vibrators, where the vibration energy decays exponentially with distance, is immersed in a liquid, the electric conductance G varies depending on the immersion depth. The experiments carried out using a thickness-extensional-mode vibrator operating at the resonance frequency of 2.01 MHz have shown that the G-value varies almost linearly with the immersion depth. It has also been found that the use of thickness-shear-mode vibrators is effective for liquids having high viscosity.4. Equivalent network representation has been derived for length-extensional vibration modes in a side-plated piezoelectric bar with a varying parameter along it. The network model is applicable to the simulation of the operation of vibrators that have a special electrode form devised for suppressing overtone modes. The model is also effective for modeling the operation of interdigital transducers (IDTs) for excitation and detection of surface acoustic waves (SAWs). Less
1. 研究了利用纵模压电振子产生的气膜阻尼效应进行接近传感。振动器由从140°旋转y形切割LiNbO_3晶圆上切下的细棒组成,该晶圆一端有玻璃板。玻璃板靠近作为测试对象的亚克力板。对于工作在80.9 kHz第一共振频率的振子,在振子与物体的距离d小于0.5 mm的范围内,q值从8,000显著降低到1,000。在有两条节点线的第二模式下运行时,初始q值减小到3500。然而,在第一种模式下,振动器可以得到更稳定的支撑。从这些结果可以证实,所提出的利用气膜阻尼效应的系统可以应用于接近传感器。短句来源当陷能振子的周围区域(振动能量随距离呈指数衰减)浸入液体中时,其电导率G随浸入深度的变化而变化。在2.01 MHz的频率下,用厚度-扩展型振动器进行了实验,结果表明,g值随浸没深度几乎呈线性变化。还发现,使用厚度剪切型振动器对高粘度液体是有效的。推导了沿边参数变化的侧镀压电杆的长-伸振动模态的等效网络表示。该网络模型适用于具有抑制泛音模式的特殊电极形式的振子的运行仿真。该模型还可以有效地模拟用于激发和探测表面声波(saw)的数字间换能器(idt)的操作。少
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
圧電定数に分布を持つ圧電板における横効果伸び振動の等価回路表示
具有压电常数分布的压电板横向效应伸长振动的等效电路表示
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Ken;Yamada;Shou;Kaneko;Tatsuya;Nagasawa;Ken YAMADA;Ken YAMADA;山田 顕;山田 顕
- 通讯作者:山田 顕
Basic study on proximity sensing utilizing air-film damping effect caused by longitudinal-mode piezoelectric vibrator
利用纵模压电振子气膜阻尼效应的接近传感基础研究
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:Ken;YAMADA;Shou;KANEKO;Tatsuya;NAGASAWA
- 通讯作者:NAGASAWA
Equivalent network representation for length-extensional vibration modes in a side-plated piezoelectric bar with a varying parameter.
具有变化参数的侧板压电棒中长度延伸振动模式的等效网络表示。
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Ken;Yamada;Ken YAMADA;Ken Yamada
- 通讯作者:Ken Yamada
Basic Study on Proximity Sensors Utilizing Air-Film Damping Effect Caused by Longitudinal-Mode Piezoelectric Vibrator
- DOI:10.1143/jjap.47.3929
- 发表时间:2008-05
- 期刊:
- 影响因子:1.5
- 作者:Ken Yamada;S. Kaneko;T. Nagasawa
- 通讯作者:Ken Yamada;S. Kaneko;T. Nagasawa
Equivalent Network Representation for Length-Extensional VibrationMode s in Side-Plated Piezoelectric Bar with Varying Parameter Operating through Transverse Piezoelectric Effect
通过横向压电效应作用的变参数侧板压电棒中长度-延伸振动模态的等效网络表示
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Ken;YAMADA;Shou;KANEKO;Tatsuya;NAGASAWA;Ken YAMADA
- 通讯作者:Ken YAMADA
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