Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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TL;DR: In this paper, the authors proposed a delay-line light-modulation scheme for a wideband, instantaneous spectrum (ISV) modulator with a delay line light-emitting diode (LED).
Abstract: [78] L. B. Lambert, “Wide-Band, Instantaneous Spectrum An[81] D. L. Hecht, “Acousto-Optic Nonlinearities in Multi-Frequency alyzers Em loying Delay-Line Light Modulators,” IRE Inf . Acousto-Optic Diffraction,” Tnt’l. Quantum Electron Conf., Conv. Rec., fit. 6, Vol. 10, Mar. 1962, pp. 69-78. [79] R. W. Damon, W. T. Maloney, and D. H. McMahon, “Ink:; [82] A. J. DeMaria and G. E. Danielson, “Internal Laser Modulation San Francisco, June 1974.
52 citations
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TL;DR: In this article, simple approximate analytical expressions for the radiation resistance of meander tine and grating transducers for magneto-elastic surface wave transduction on YIG are developed.
Abstract: Simple approximate analytical expressions for the radiation resistance of meander tine and grating transducers for magnetoelastic surface wave transduction on YIG are developed. The standard simplifying assumptions of weak magnetoelastic coupling and the magnetostatic approximation are employed. In addition, the surface wave is heuristically modeled as a plane shear wave and the inhomogeneous elastic equation of motion is solved in the coupled mode approximation. The approximate expressions for the meander line radiation resistance compares well with a more exact numerical treatment done by other investigators. Manuscript received October 30, 1978; revised December 11,1978. This work was supported in part by the National Science Foundation under Grant ENG 75-18077. The author is with the Department of Electrical Engineering, University of Minnesota, Minneapolis, MN 55455. A
52 citations
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TL;DR: In this paper, the authors demonstrate the tunneling of audio pulses through the forbidden transmission zone of an acoustic band gap array with a periodically spaced series of dangling sidebranches using an impulse response method.
Abstract: We demonstrate the tunneling of audio pulses through the forbidden transmission zone of an acoustic band gap array. The acoustic band gap is created in a waveguide with a periodically spaced series of dangling sidebranches. Using an impulse response method, the transmission properties of the array are characterized and the regions of forbidden transmission identified. Tunneling pulses, whose frequency content lies completely with the forbidden transmission region, are used to explore the concepts of tunneling time and group velocity. In an analog of experiments that are well known for electromagnetic waves, we show that the group velocity of the tunneling pulse is considerably larger than the speed of sound. The dynamics of pulse reshaping that lead to this phenomenon are discussed.
51 citations
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TL;DR: In this paper, an air-coupled sensor detects propagating leaky surface waves generated by a point impact event applied on the concrete surface, which can be easily detected by the sensor due to the large out-of-plane motion of the waves.
Abstract: This research investigates air-coupled sensors used for non-contact NDT of concrete structures. An air-coupled sensor detects propagating leaky surface waves generated by a point impact event applied on the concrete surface. Compared to conventional body waves, leaky surface waves can be easily detected by the sensor due to the large out-of-plane motion of the waves. The computed velocity of the sensed leaky waves indicates the nature of the wave: Rayleigh surface waves are generated in the thick wall and Lamb waves in the thin slab. The study shows the potential of this sensing method for rapid inspection of concrete structures.
50 citations
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TL;DR: In this article, a separation process based on the acoustic radiation force created in stationary fields produced by a forced coincidence excitation at ultrasonic frequencies of fluid-filled pipes has been developed.
Abstract: A separation process based on the acoustic radiation force created in stationary fields produced by a forced coincidence excitation at ultrasonic frequencies of fluid‐filled pipes has been developed. The efficacy of this method for the collection and manipulation of fine secondary phases in flowing suspensions will be compared to equivalent operations in stationary fields generated in acoustic interferometer chambers operated without coincidence effects. The basis for the axial translation of the phases concentrated at the pressure nodes to either end of the cell as a result of an applied periodic sweep in the driving frequency will be examined.
50 citations