Download PDF by D. S. Ballantine Jr., Robert M. White, S. J. Martin,: Acoustic Wave Sensors: Theory, Design

Remote Sensing Gis

By D. S. Ballantine Jr., Robert M. White, S. J. Martin, Antonio J. Ricco, E. T. Zellers, G. C. Frye, H. Wohltjen, Moises Levy, Richard Stern

ISBN-10: 0120774607

ISBN-13: 9780120774609

Covers a large choice of sensors with specialize in analyte-film interactions for varied physical/chemical absorption approaches. rather attention-grabbing is the comparability of transients for reversible and irreversible interactions.

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Extra resources for Acoustic Wave Sensors: Theory, Design

Sample text

Nye, J. F. Physical Properties of Crystals; Clarendon Press: Oxford (1957). 6. IEEE Standard on Piezoelectricity 176-1987; IEEE Press: Piscataway, NJ (1986). Chapter 3 Acoustic Wave Sensors and Responses Devices based on piezoelectric crystals, which allow transduction between electrical and acoustic energies, have been constructed in a number of configurations for sensor applications and materials characterization. This chapter examines those devices most commonly utilized for sensing applications, including the thicknessshear mode (TSM) resonator, the surface acoustic wave (SAW) device, the acoustic plate mode (APM) device, and the flexural plate wave (FPW) device.

With devices having roughness on the order of the liquid decay length, however, the liquid-loading response was diminished by the hydrophobic surface treatment, consistent with the observations of Thompson et al. 1 Thickness-Shear Mode Resonator 63 tributed by surface roughness. The response contributed by surface roughness to the frequency shift (from an increase in motional inductance L2) arises from liquid trapping. Thus, the liquid trapping process is apparently being modified by changes in the liquid contact angle.

In considering only the mechanical properties of the crystal, however, we neglected consideration of how these resonances would actually be excited or detected. The device uses a piezoelectric substrate material in which the electric field generated between electrodes couples to mechanical displacement. This allows electrical excitation and detection of mechanical resonances. In constructing a practical sensor, changes in resonant frequency of the device are measured electrically. The electrical characteristics of the resonator can be described in terms of an equivalent-circuit model that describes the impedance (ratio of applied voltage to current) or admittance (reciprocal of impedance) over a range of frequencies near resonance.

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Acoustic Wave Sensors: Theory, Design by D. S. Ballantine Jr., Robert M. White, S. J. Martin, Antonio J. Ricco, E. T. Zellers, G. C. Frye, H. Wohltjen, Moises Levy, Richard Stern

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