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 by means of an interdisciplinary staff of specialists from either and academia, Acoustic Wave Sensors presents an in-depth examine the present country of acoustic wave units and the scope in their use in chemical, biochemical, and actual measurements, in addition to in engineering purposes. a result of inherent interdisciplinary purposes of those units, this publication may be invaluable for the chemist and biochemist drawn to the use and improvement ofthese sensors for particular purposes; engineer inquisitive about the layout and development of those units; the chemical engineer and the biotechnologist drawn to utilizing those units for method tracking and keep an eye on; and the sensor neighborhood at large.
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Additional info for Acoustic Wave Sensors. Theory, Design, & Physico-Chemical Applications
4 (page 7), there are several ways of detecting such changes. One is the “active” approach in which one makes the sensor a part of an electronic oscillator circuit so that a change in the characteristics of the acoustic path cause a change in the frequency of the oscillator. 2a), as the resonator was originally made for use in electronic oscillators. In a typical vapor-sensing application, the sorption of vapor molecules in a polymeric coating applied to one surface of the crystal increases the crystal’s mass and lowers its resonant frequency and that of the circuit in which it is installed.
2 that isotropic materials, such as polyethylene and polycrystalline aluminum, are specified by only two independent elastic constants: c11 and c44. Alternatively, one may characterize the elastic properties of an isotropic medium by Young’s modulus and Poisson’s ratio, E and v respectively, or by the Lamé constants, λ and μ. See . Anisotropic crystals, such as lithium niobate, quartz, and zinc oxide, require several more elastic constants. 1 in a cubic material. 1 it was found that S11=kh. In reduced notation,S1=kh, while S2 through S6 are all zero.
3 volts. 7. The electric field can be found by differentiating the potential: Ex= −∂ϕ/∂x= −jkϕ. 7. 7 Electric field propagating along with mechanical wave in ZnO. 2 ENERGY DENSITY AND POWER FLOW Because passage of an elastic wave causes time-harmonic deformation of a crystal, each unit volume through which the wave passes has time-varying potential (strain) energy and kinetic energy. At any point in the crystal, the time-varying potential energy is maximum when strain, or deformation, of the crystal at that point is maximum and the local particle velocity is zero; after one-quarter wave period has elapsed, local deformation of the crystal reaches zero and velocity (hence kinetic energy) reaches its maximum absolute value.
Acoustic Wave Sensors. Theory, Design, & Physico-Chemical Applications 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
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