By David Stephen Ballantine; et al
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Extra resources for Acoustic wave sensors : theory, design, and physico-chemical applications
A region having significant acoustic amplitude) of the device surface. Acoustic sensing is possible only when the film (or adjacent medium) interacts with the acoustic modes. Thus, the film must serve as a chemical-to-physical t r a n s d u c e r - one or more of its physical properties must change in response to the presence (and, optimally to an extent proportional to the concentration) of the chemical species to be detected. Clearly, important sensor parameters such as sensitivity, selectivity, reversibility, and durability are critically dependent on this chemically sensitive film, as detailed in Chapter 5.
The dependencies of these quantities on a given perturbation therefore will be the subject of numerous theoretical calculations as well as experimental measurements to be discussed in later chapters. 55 to define a complex power transfer Prfrom the wave, by the perturbation, that accounts for both power dissipation Pd and changes in stored energy AU: Pr = Pd + j2toAU. 61) giving a general relationship between power transferred from the wave P r and the resulting changes in the wave propagation factors, Av/vo and Aa/k.
10 can be used to predict the change in frequency contributed by the film, using Ps = ph. 3: Does a 1 p m film on a 5 MHz TSM resonator that has G = 101° dyne/cm 2 and p = 1 g/cm 3 behave as an ideal mass layer? If so, what frequency shift does it cause? 03. Since this phase shift is small compared with ~r, the dominant contribution to the resonator response is due to the film mass and it may be considered an ideal mass layer. 7 kHz. The previous example illustrates the calculation of frequency shifts caused by films that behave as an ideal mass layer.
Acoustic wave sensors : theory, design, and physico-chemical applications by David Stephen Ballantine; et al