Mechanical Displacement Measurement Using a Leaky Lamb Wave Delay Line Oscillator
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概要
- 論文の詳細を見る
A measurement technique for mechanical displacement using a liquid delay line oscillator is described. The delay line is composed of a leaky Lamb wave device with two interdigital transducers(IDTs), a liquid cavity as the propagation medium for an ultrasound beam and an amplifier connected between two IDTs, The IDT for leaky Lamb waves functions as a longitudinal wave radiator or a detector of a reflected ultrasound beam from the surface of a wall in the liquid cavity. The two lowest modes, S_0 and A_0, propagating in a thin piezoelectric ceramic plate are useful for constructing the leaky wave transducer because of high transducer efficiency. The acoustic delay length changes with mechanical displacement, which results in a change of oscillation frequency. The basic performance of the delay line oscillator is presented with the results of measurements in two operating modes, S_0 and A_0.
- 社団法人応用物理学会の論文
- 2000-05-30
著者
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TODA Kohji
Department of Electrical and Electronic Engineering, National Defense Academy
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FUJITA Takeshi
Department of Dental and Biomedical Materials Science, Unit of Basic Medical Sciences, Graduate Scho
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Toda Kohji
Departmemt Of Electronic Engineering National Defense Academy
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Fujita Takeshi
Department Of Electronic Engineering National Defense Academy
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Fujita Takeshi
Department Of Applied Physics Osaka City University
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