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Acoustical Physics

, Volume 54, Issue 2, pp 269–278 | Cite as

The possibility of generating focal regions of complex configurations in application to the problems of stimulation of human receptor structures by focused ultrasound

  • L. R. Gavrilov
Acoustics of Living Systems. Bioacoustics
First Online:
Received:

Abstract

Studies of the stimulating effect of ultrasound on human receptor structures have recently become more intensive in connection with the development of promising robotic techniques and systems, sensors, and automated control systems, as well as with the use of taction in the design of a human-machine interface. One of the promising fields of research is the development of tactile displays for transmission of sensory data to a human by an acoustic method based on the effect of radiation pressure. In this case, it is necessary to generate rapidly changing patterns on a display (symbols, letters, digits, etc.), which may often have a complex shape. It is demonstrated that such patterns can be created by the generation of multiple-focus ultrasonic fields with the help of two-dimensional phased arrays whose elements are randomly positioned on the surface. The parameters for such an array are presented. It is shown that the arrays make it possible to form the regions of action by focused ultrasound with various necessary shapes and the sidelobe (or other secondary peak) intensity level acceptable for practical purposes. Using these arrays, it is possible to move the set of foci off the array axis to a distance of at least ±5 mm, which corresponds to the display dimensions. It is possible, on the screen of a tactile display, to generate the regions of action with a very complex shape, for example, Latin letters. This opportunity may be of interest, for example, for the development of systems that enable a blind person to perceive the displayed text information by using the sense of touch.

PACS numbers

43.80.Sh 
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Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  1. 1.Andreev Acoustics InstituteMoscowRussia

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