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

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

Written by means of an interdisciplinary workforce of specialists from either and academia, Acoustic Wave Sensors presents an in-depth examine the present kingdom of acoustic wave units and the scape in their use in chemical, biochemical, and actual measurements, in addition to in engineering purposes. as a result of inherent interdisciplinary functions of those units, this e-book could be important for the chemist and biochemist attracted to the use and improvement of those sensors; engineer occupied with their layout and development; the chemical engineer and the biotechnologist drawn to utilizing them for method tracking and keep an eye on; 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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See Ref. [9]. ) 54 3. Acoustic Wave Sensors and Responses toward lower frequency without affecting the admittance magnitude. The admittance of the TSM resonator under mass loading can be obtained from the unperturbed case by the addition of the inductance L2 to the motional arm of the equivalent circuit. This element represents the increased kinetic energy contributed by the mass layer moving synchronously with the TSM resonator surface. 14) after adding an inductance value L2 = 188/~H corresponding to the surface mass density of 225/zg/cm 2.

5 Equivalent-circuit models to describe the near-resonant electrical characteristics of the resonator: (a) distributed model; (b) lumped-element model. (Reprintedwithpermission. See Refs. [7; 14). 1 Thickness-Shear M o d e Resonator 47 With an unperturbed device the surfaces may be considered stress-free boundaries (neglecting electrode mass): Tl = T2 = 0, so that Zs = 0. 5a. 5b, to describe the near-resonant electrical characteristics [7]. This lumped-element model is called the "Butterworth-Van Dyke" equivalent circuit [8].

34b) where we note that R2 --- tosL2 for loading by a Newtonian fluid [14]. 34 were derived for one-sided liquid contact; for two-sided, L2 and R2 are doubled. The motional inductance L2. 23 in agreement with the prediction of Kanazawa and Gordon [18]: ~f,---- L2fs _ 2LI f3/2 . 35) " The motional resistance, R2, represents power radiated into the contacting liquid by the oscillating device surface. " This motional resistance leads to resonance damping. Muramatsu et al. [19] and Beck et al.

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