Download Acoustic Wave Sensors: Theory, Design, & Physico-Chemical by D. S. Ballantine Jr., Robert M. White, S. J. Martin, PDF
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 through an interdisciplinary team of specialists from either and academia, Acoustic Wave Sensors presents an in-depth examine the present kingdom of acoustic wave units and the scope in their use in chemical, biochemical, and actual measurements, in addition to in engineering functions. end result of the inherent interdisciplinary purposes of those units, this e-book might be priceless for the chemist and biochemist drawn to the use and improvement ofthese sensors for particular functions; engineer interested by the layout and development of those units; the chemical engineer and the biotechnologist attracted to utilizing those units for approach tracking and keep watch over; and the sensor neighborhood at huge. Key beneficial properties* presents in-depth comparability and analyses of alternative forms of acoustic wave units* Discusses working rules and layout issues* contains desk of correct fabric constants for fast reference* provides an in depth evaluate of present makes use of of those units for chemical, biochemical, and actual measurements, and engineering functions
Read Online or Download Acoustic Wave Sensors: Theory, Design, & Physico-Chemical Applications (Applications of Modern Acoustics) (Applications of Modern Acoustics) PDF
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Extra info for Acoustic Wave Sensors: Theory, Design, & Physico-Chemical Applications (Applications of Modern Acoustics) (Applications of Modern Acoustics)
TSM resonator electrical characteristics are typically described in terms of electrical admittance, defined as the ratio of current flow to applied voltage (the reciprocal of impedance). 13) 48 3. Acoustic Wave Sensors and Responses where the motional impedance for the unperturbed resonator is 1 Zm = R1 + jtoLI + -jas ----. , 1 jtosL~ + . . = 0. 16) for the unperturbed device. 15 indicate that the motional branch has a net inductance. 6 shows the admittance magnitude and phase angle measured near the fundamental resonance of a TSM resonator in air.
19) u2(x,t) = A+e j(~-~ri) e -ax, in which a is the attenuation of the wave. 20) --/90)2 = (C44 + jtor/44)(Ot + jk) 2. 22) and 0 = 2~kc44 + tor/44(ot2 - k2). The presence of the viscous damping term results in a second-order perturbation of the wave velocity and a first-order contribution to the attenuation. 23) in which the viscous term 7144characterizes the damping of this y-polarized shear wave. The important point to note from this example is that the attenuation is proportional to the square of the frequency.
The waves are generated only at the electrodes because those are the only regions in the crystal where the piezoelectric source term eqkE varies spatially. 1) where A and B are constants, r is the angular excitation frequency (r = 2,trf), k is the wavenumber, t is time, and j = (-1)1/2. 3, which may be thought to originate at the top electrode. = r phase shift) and is once again propagating downward having experienced a total round-trip phase shift of (2khs + 2fir), where hs is the thickness of the crystal.