Characteristics of interdigital transducers for mechanical sensing and non-destructive testing

Toda, Kohji

doi:10.1016/0924-4247(94)00809-4

Cited by 4 publications

(4 citation statements)

References 46 publications

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“…Acoustic sensing has been widely used for NDT [169]- [174]. NDT sensors can be broadly classified into two types: the conventional external scanning sensors, and the newer embedded sensors.…”

Section: H Nondestructive Testingmentioning

confidence: 99%

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Interdigital sensors and transducers

et al. 2004

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Section: H Nondestructive Testingmentioning

confidence: 99%

“…As can be seen, these methods are extremely time consuming and, hence, expensive when large areas are to be covered. Reference [180] discusses many important applications of NDT using SAW.…”

Section: H Nondestructive Testingmentioning

confidence: 99%

Interdigital sensors and transducers

et al. 2004

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“…There have been many attempts in the last two decades to fabricate acoustic biosensors from piezoelectric substrates. − Practical difficulties in developing acoustic wave geometries into economic devices persist; for example, SAW and BAW devices cannot readily be miniaturized and integrated into either useable array detectors or practical single element devices. The noncontact MARS device is the first acoustic transducer to use enhanced magnetic direct generation in a simple metallized glass disk .…”

Section: Discussionmentioning

confidence: 99%

“…Acoustic wave biosensors fabricated from piezoelectric substrates have been extensively exploited to monitor electromechanical changes occasioned by binding complementary ligands to adsorbed films of biomolecules. − Recognition of the measurand by the bioselective layer immobilized on the piezoelectric plate results in perturbations in mass loading, elasticity, viscosity, dielectric properties, or conductivity, which are detected electrically, following changes in the velocity of the propagating acoustic wave − through the device. Acoustic wave transducers are conventionally divided into bulk acoustic wave (BAW) 8 and surface acoustic wave (SAW) 9,10 devices.…”

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confidence: 99%

A Strategy for Chemical Sensing Based on Frequency Tunable Acoustic Devices

2001

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A new acoustic sensor geometry, the magnetic acoustic resonant sensor (MARS), is described. The device comprises a circular 0.5-mm-thick resonant plate fabricated from a wide variety of nonpiezoelectric materials and coated on the underside with a 2.5-microm-thick aluminum film. Harmonic radial shear waves over at least a 2 orders of magnitude frequency range can be induced in the resonant plate by enhanced magnetic direct generation using a noncontacting rf coil and NdFeB magnet. Mass loading with adherent aluminum films produced frequency changes of 106 Hz/nm (40.8 Hz/ng-mm(-2)), while contact with viscous fluids resulted in maximum changes of 15 446 Hz/cP. At an operating frequency of 50 MHz, the device detected viscosity changes as low as 0.0006 cP. The adsorption of proteins such as human IgG and the binding of a complementary antigen, goat anti-human IgG, on the upper nonmetallized surface of the device has been monitored with a detection limit of approximately 75 ng/mL. The binding of substrates and allosteric effectors to glycogen phosphorylase b has provided evidence that the device is very sensitive to viscoelastic changes in adsorbed proteins. The MARS device generates radial shear acoustic waves over a broad bandwidth that are unaffected by the conductivity of the solution. These results suggest that simple metal, glass, crystalline, or polycrystalline plates can be used as a new type of tunable acoustic immunosensor.

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