By D. S. Ballantine, Jr.,Robert M. White,S. J. Martin, et al.Elsevier|Elsevier Science||Academic PressAdult NonfictionScience, TechnologyLanguage(s): EnglishOn sale date: 13.05.2011Street date: 21.10.1996
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 functions of those units, this ebook could be helpful for the chemist and biochemist attracted to the use and improvement ofthese sensors for particular purposes; engineer excited by the layout and development of those units; the chemical engineer and the biotechnologist drawn to utilizing those units for technique tracking and keep watch over; and the sensor neighborhood at large.
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Additional info for Acoustic Wave Sensors. Theory, Design, & Physico-Chemical Applications
Thermoelastic attenuation arises in compressional waves due to heat flow from compressed to expanded regions. The flow of heat is an irreversible process that increases entropy, which in turn can be related to attenuation. Thermoelastic attenuation is proportional to the thermal conductivity of the solid and, while important in metals, is not the dominant damping mechanism in insulators used in acoustic devices. 17) in which the viscosity tensor ηIJ has the same symmetry as the elastic stiffness tensor cIJ.
3 (page 6). This range is nearly as large as that commonly shown in charts of the electromagnetic wave spectrum. 3 shows that there are many other types of acoustic sensors designed for purposes ranging from imaging the human heart to detecting cracks in airplane parts . 3 Acoustic-wave spectrum. Almost as broad as the familiar electromagnetic-wave spectrum, the spectrum of acoustic waves that have been excited or detected covers frequencies that range over roughly eighteen orders of magnitude.
In this device, acoustic waves are generated and detected with the comblike conducting structures shown at each end of the device; a piezoelectric material in the device substrate converts energy between electrical and mechanical forms at the comblike structures. 2d). 2 Schematic sketches of the four types of acoustic sensors discussed in detail in this book: (a) Resonant quartz crystal like that used in electronic communications systems (after Lu ); (b) Surface-acoustic-wave delay line with selective absorptive coating (after Wohltjen and Dessy ); (c) Acoustic-plate-mode delay line made from quartz crystal (after Ricco and Martin ); (d) Thin-membrane flexural-plate-wave delay line made by microfabrication techniques from a silicon wafer.