1988. school papers

Microwave filters based on coupled MSW resonators and their applications: A novel and simple technique for realizing tunable and planar microwave bandpass filters has been investigated. The use of coupled magnetostatic wave (MSW) resonators for realizing these filters is demonstrated. Due to their low magnetic losses, epitaxially grown single-crystal yttrium iron garnet (YIG) films are used for the MSW propagation. The i....; Authors:Hanna;S.M.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Torsional mechanical filters at 500 kHz: A torsional mechanical filter configuration has been developed for operation in the commonly used IF (intermediate frequency) range of 500 kHz, utilizing third torsional-mode electromechanical transducer resonators in conjunction with second torsional-mode interior resonators. This structure was derived by extension of the lower-frequency (typicall....; Authors:Domino;W.J.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

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

Online statistical process control with NDE and computers: It is shown that, for statistical process control (SPC) using ultrasonic instruments for nondestructive evaluation (NDE) directly interfaced with a computer, a variable in every part can be measured at production line speeds and used in groups, typically of five, to generate points for control charts. The process control computer can then analyze t....; Authors:Papadakis;E.P.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Practical ultrasonic spectrometric measurement of solution concentrations by a tracking technique: The authors designed and tested a practical measurement technique for solutions, based on a resonator with enclosed piezoceramics which can operate at a resonant frequency mode around 500 kHz. The resonance can be tracked automatically by means of a phase-locked loop. The authors report measurements made on water-methanol mixtures, showing that con....; Authors:Dion;J.L.;Barwicz;A.;Bouchard;J.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

Ultrasonic techniques for measurement of coal slurry viscosity: The authors present a technical evaluation of ultrasonic methods as applied to the measurement of slurry viscosity. The four ultrasonic techniques examined were measurement of attenuation, acoustic impedance, relaxation, and acoustic streaming and cavitation. Acoustic impedance measurements are more sensitive to slurry viscosity than to any other f....; Authors:Sheen;S.H.;Reimann;K.J.;Lawrence;W.P.;Raptis;A.C.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

Prototype microwave acoustic fluid sensors: The properties of the acoustic wave in a fluid overlay on a piezoelectric substrate are investigated for two different geometries: bounce mode and waveguide mode. Acoustic wave properties such as velocity and attenuation are obtained as a function of the fluid layer thickness and the physical properties of the fluid layer. It is shown that subtle c....; Authors:Lee;R.;Vetelino;J.F.;Clarke;P.;Roy;A.;Turner;J.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

Flow sensor using surface acoustic waves: The use of a surface-acoustic-wave (SAW) device to measure rate of gas flow is described. The device is a delay-line stabilized SAW oscillator heated to a suitable temperature above the ambient. The delay line is placed in the path of the flowing gas. Flow of gas carries heat away by convection. This lowers the substrate temperature, thereby causin....; Authors:Joshi;S.G.Publisher:Ultrasonics Symposium;1988. Proceedings.;IEEE 1988Conference Date:2-5 Oct. 1988ISSN:Total Page:2 vol. 1113

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