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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 article, the propagation and reflection of plane elastic waves in the acousto-optic crystals tellurium dioxide and calomel as well as in the ferroelectric material barium titanate is examined.
Abstract: Propagation and reflection of plane elastic waves in the acousto-optic crystals tellurium dioxide and calomel as well as in the ferroelectric material barium titanate is examined in the paper. The reflection of the waves from a free and flat boundary separating the crystal and the vacuum is investigated in the (001) planes of TeO2, Hg2Cl2 and BaTiO3 in the case of glancing acoustic incidence on the boundary. The analysis shows that as much as two elastic waves may be reflected from the crystal surface. Energy flow of one of the reflected waves in paratellurite and calomel propagates in a quasi-back direction with respect to the incident energy flow so that both energy flows are separated by an angle as narrow as a few degrees. It is found that a relative intensity of the unusually reflected wave in the acousto-optic crystals may be close to a unit in a wide variety of crystal cuts. Possible applications of the examined phenomena in acousto-optic devices are discussed in the presentation.
Proceedings ArticleDOI
01 Jan 1979
TL;DR: In this paper, surfacc acoustic waves are used to create traveling longitudinal electric fields in the silicon and t o replace the multiphase clocks of CCD, and the charges may be injected into the wells by light or using a PN junction as in a conventional CCD.
Abstract: IN RECENT YEARS the charge-coupled device’ has been creating a great deal of interest for applications in memory, signal processing and imaging. The incentive for the interest lies in the simplicity in structure and high density. However, the CCD technology has a number of drawbacks which limit the density, the speed and the processing simplicity. For instance, in a typical CCD structure three or four phase clocks arc required to transfer the charges, multilevel metallization is required to effect the multiphase clocks, buried channel is required t o improve the speed, and for imagers, separate charge storage and transfer areas must be provided because of the masking of the clock busses. This paper will offer a study of a way to circumvent these problems by means of surface acoustic waves involving a monolithic device, whose operation will be described. In the SAW--CTD device, surfacc acoustic waves are used to create traveling longitudinal electric fields in the silicon and t o replace the multiphase clocks of CCD. The traveling electric fields create potential wells which will carry along charges that may be stored in the wells; Figure 1. The charges may be injected into the wells by light or using a PN junction as in a conventional CCD.
Journal ArticleDOI
TL;DR: In this article, it has been observed that the surface acoustic wave intensity required to produce maximum acoustic emission count decreases with increasing cell thickness and the changes occurring in the liquid crystal when subjected to surface acoustic waves were studied using a polarising microscope and the results were explained on the basis of this visual observation.
Journal ArticleDOI
TL;DR: In this paper, a two-dimensional ultrasonic transducer array with a topographic channel structure for liquid flow is used to develop micro-actuators for small particles and micro-pumps for liquid.
Abstract: The irradiation of ultrasonic waves to liquid causes liquid flow toward the propagation direction of the ultrasonic waves. This paper proposes the application of this phenomenon, called acoustic streaming, to the development of micro-actuators such as micro-manipulators for small particles and micro-pumps for liquid. Since high-frequency ultrasonic waves induce acoustic streaming very efficiently only in the vicinity of the transducer, micro-manipulators are shown to be realised by using a two-dimensional ultrasonic transducer array and controlling electrical power supplied to each transducer. It is also concluded that micro-pumps could be developed by combining a transducer array with a topographic channel structure for liquid flow.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433