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
Covers a large choice of sensors with specialize in analyte-film interactions for numerous physical/chemical absorption approaches. quite fascinating is the comparability of transients for reversible and irreversible interactions.
Read or Download Acoustic Wave Sensors: Theory, Design PDF
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Additional info for Acoustic Wave Sensors: Theory, Design
Next, the effect on wave propagation of power dissipation in a lossy medium is considered. From conservation of energy, the power dissipated by the wave Pd (power/volume) must be balanced by a reduction in power transmitted by the wave P. If the wave is propagating in the x direction, then ed = OP Ox -- --'-. 53) OP - - 2t~P. 55 indicates the relationship between wave attenuation and power dissipation in the medium: attenuation is one-half the ratio of power dissipated to power transmitted by the wave.
B ~ , __ J. I _ _ - -- I- ~ lI? I. . . J. __ - -- J - - - -- - - - - . 12 Cross-section of a liquid meniscus formed as liquid penetrates into a sinusoidally-textured surface, illustrating contact angle-dependent trapping : (a) with trapped air, and (b) without trapped air. The dashed lines indicate the initial (nonequilibrium) penetration of liquid for the indicated microscopic contact angle. The solid lines indicate the equilibrium penetration, becoming complete for 0 < 108 ~ (upper) or 0 < 117 ~ (lower).
It acts as an acoustically thin layer. The Rayleigh hypothesis indicates that when mass accumulates on the surface, the resonant frequency must change to rebalance kinetic and potential energies. The peak kinetic energy density Uk (energy per surface area) in the TSM resonator occurs at the instant when particle velocities are maximum and displacements are zero. 5) where Ps is the areal mass density (mass/area) of the surface mass layer and pq is the volume mass density (mass/volume) of the quartz substrate.