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Covers a wide selection of sensors with concentrate on analyte-film interactions for varied physical/chemical absorption methods. really fascinating is the comparability of transients for reversible and irreversible interactions.
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Additional resources for Acoustic Wave Sensors: Theory, Design
For Ps "~. 9) indicating that the fractional shift in resonant frequency is equal to the fractional change in mass contributed by the mass layer. 8 has been found to hold for mass fractions up to about 2% . Lqtoq) l/2 . 65 g/cm 3. 1 Hz, calculate the limit of mass resolution. 9, S = dfldps = -fol(pqh) = -57 Hz-cm2/~g. This means that for each 1/zg/cm 2 of mass accumulation, the resonant frequency will decrease by 57 Hz. 3 Hz)/(57 Hzcm2//zg) = 5 ng/cm 2. The high mass sensitivity calculated in the previous example justifies the term "microbalance" in describing the sensing capabilities of the quartz resonator.
8, page 32) through which a wave is passing, the transit time for the wave across the cube is ~"= 1Iv. When the wave passes through the cube, the energy density in the cube increases by the incident power times the transit time: U = P~" = P/v. Thus, P = Uv. , one in which P is constant. 48) ' where vo and Uo denote unperturbed propagation velocity and energy density, 32 2. 8 Energy stored per unit volume is dependent upon incident power flow and propagation velocity. respectively. 48 represents a fundamental relation between wave velocity and energy density for a system excited at a given frequency: the fractional change in wave velocity is equal to the negative of the fractional change in wave energy density.
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.