2-5 Oct. 1988 school papers

Ultrasonic motors: An ultrasonic motor is proposed which uses two piezoelectric elements in the stator. One element is used to generate a vibration polarized with respect to the direction of motion of the rotor or the slider. The other one generates a vibration perpendicular to the motion of the rotor. By imaging the ratio of the vibration amplitudes and the phase, t....; Authors:Ueha;S.;Kurosawa;M.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Feature extraction and learning decision rules from ultrasonic signals-applicability in non-destructive testing: The author presents a supervised multiple-concept learning method for generating decision rules from a set of ultrasonic data for defect characterization purposes in nondestructive testing. The first step towards flaw discrimination is to extract relevant information from the collected defect signatures. The large-dimension signal space is mapped i....; Authors:Perron;M.-C.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Analysis of liquid-phase-based sensors utilizing SH surface waves on rotated Y-cut quartz: Surface shear horizontal (SH) wave propagation at the boundary of rotated Y-cut quartz with a viscous fluid is theoretically analyzed for liquid-phase-based sensor applications. Analytical expressions are obtained for the fractional velocity change and attenuation coefficient in terms of the material constants, liquid viscosity and density, and wav....; Authors:Shana;Z.;Josse;F.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Generalized Lamb-wave multisensor: Integrated-circuit fabrication techniques were used to make a versatile silicon-based sensor that uses elastic wave propagation in a plate that is thin compared with the wavelength. In-plane tension raises the velocity of the lowest antisymmetric flexural wave (474 m/s) above that predicted for a pure Lamb wave (422 m/s). Because of the low velocit....; Authors:Wenzel;S.W.;Martin;B.A.;White;R.M.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Microscale mechanics for sensors and actuators: Microscale mechanical structures have been conceived and fabricated that make possible a wide variety of microsensors and microdynamical moving elements. Miniature sensors and microscopic moving elements on a chip are made by standard integrated-circuit fabrication techniques, augmented with special etches and deposited films. An integrated audio m....; Authors:White;R.M.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Electromagnetic radiation from an AT-cut quartz plate under lateral-field excitation: Equations of linear piezoelectricity (with the quasistatic approximation) for the plate and Maxwell's equations for the electromagnetic field in the surrounding vacuum are solved for the thickness-shear vibrations of an AT-cut quartz plate. For an AT-cut plate vibrating near the thickness-shear resonance excited by a uniform, lateral electric field....; Authors:Lee;P.C.Y.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Ion beam milled acousto-optic Bragg cells: The author reports the progress made on the development of acousto-optic Bragg cells for use in the 2-3-GHz range. These devices can satisfy a number of one- and two-dimensional analog signal processing applications, including power spectrum, cross ambiguity and Wigner functions, beamforming and matrix transforms. The transducer structure consists ....; Authors:Penunuri;D.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

High performance wideband Bragg cells: High-performance wideband Bragg cells suited to EW receiver applications were developed using L[111] and S[110] modes in GaP. Efficiency enhancement was demonstrated using a planar phased array design. Demonstrated results include a 1-GHz bandwidth device with a diffraction efficiency of 100 % per RF watt. The unified theory of IMPs (intermodulati....; Authors:Chang;I.C.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Integrated acoustooptic device modules in LiNbO/sub 3/ for digital data processing: A titanium-indiffusion proton-exchange waveguide microlens has been utilized to construct a multichannel integrated acoustooptic module which simultaneously utilizes acoustooptic (AO) and electrooptic (EO) Bragg diffractions in a common LiNbO/sub 3/ substrate. The module consists of a channel-waveguide array, a planar waveguide, a linear microlens ....; Authors:Zang;D.Y.;Le;P.;Tsai;C.S.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Pulsed photothermal spectroscopy with near-field detection: The author investigated the conditions under which pulsed photothermal spectroscopy may be practised using near-field detection of deformation or temperature. It is shown that there are several ways to do this, with accessible ranges of absorption coefficient differing somewhat. As with previous photoacoustic/photothermal spectroscopies, spectrosco....; Authors:McDonald;F.A.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

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