Acoustic Wave Sensors - Theory, Design, and Physico-Chemical by D. S. Ballantine Jr., Robert M. White, S. J. Martin,

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

Written via an interdisciplinary team of specialists from either and academia, this e-book offers an in-depth examine the present nation of acoustic wave units and the scope in their use in chemical, biochemical, and actual measurements, in addition to in engineering functions. a result of inherent interdisciplinary functions of those units, this publication can be invaluable for the chemist and biochemist drawn to the use and improvement of those sensors for particular purposes; engineer occupied with the layout and development of those units; the chemical engineer and the biotechnologist drawn to utilizing those units for technique tracking and keep watch over; and the sensor group at huge.

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Extra resources for Acoustic Wave Sensors - Theory, Design, and Physico-Chemical Applications

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4 describes a family of thickness-shear modes, each having a unique standing shear-wave pattern across the crystal thickness. 4 (page 42) illustrates the mode profiles for the fundamental (N = 1) and third-harmonic (N = 3) resonances. These modes are referred to as "thickness-shear" because the shear displacement varies across the thickness of the device. Note that these modes do not involve any change in the thickness of the substrate. 33 mm, these modes are excited at approximately 5 and 15 MHz, respectively.

9 will describe the treatment when films do not meet this criterion. 2 ELECTRICAL CHARACTERISTICS OF AN UNPERTURBED TSM RESONATOR In the previous section we considered the conditions under which mechanical resonances would occur in a TSM resonator. 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.

23) The formalism outlined above will be applied to determine equivalent-circuit models for a TSM resonator with (1) an ideal mass layer, (2) a contacting semiinfinite liquid, and (3) a viscoelastic film. By determining the mechanical impedance Zs associated with each perturbation, the equivalent-circuit model arising from each can be obtained. In cases where the perturbation cannot be easily modeled, the procedure can be reversed: the resonator response is used to determine Zs and thereby characterize the perturbation.

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