An Economical Touch Panel Using SAW Absorption

Adler, R.; Desmares, P.

doi:10.1109/t-uffc.1987.26932

Cited by 71 publications

(12 citation statements)

References 4 publications

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“…This position is then used for human-machine interaction ͑e.g., finger tracking on computer screen͒. 3,4 or time-of-flight techniques, 5,6 the timereversal technique can be applied to most solids without any prior knowledge of acoustic properties. However, many human-machine interfaces prefer "touch" sensing than impact localization, because touch is perceived as a more userfriendly interaction.…”

Section: To Cite This Versionmentioning

confidence: 99%

Tactile objects based on an amplitude disturbed diffraction pattern method

Liu

Nikolovski

Mechbal

et al. 2009

Applied Physics Letters

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible.This is an author-deposited version published in: http://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/6519 To cite this version :Yuan LIU, Jean-Pierre NIKOLOVSKI, Nazih MECHBAL, Moustapha HAFEZ, Michel VERGÉ -Tactile objects based on an amplitude disturbed diffraction pattern method -2009Any correspondence concerning this service should be sent to the repository Administrator : archiveouverte@ensam.eu Tactile sensing is becoming widely used in human-computer interfaces. Recent advances in acoustic approaches demonstrated the possibilities to transform ordinary solid objects into interactive interfaces. This letter proposes a static finger contact localization process using an amplitude disturbed diffraction pattern method. The localization method is based on the following physical phenomenon: a finger contact modifies the energy distribution of acoustic wave in a solid; these variations depend on the wave frequency and the contact position. The presented method first consists of exciting the object with an acoustic signal with plural frequency components. In a second step, a measured acoustic signal is compared with prerecorded values to deduce the contact position. This position is then used for human-machine interaction ͑e.g., finger tracking on computer screen͒. 3,4 or time-of-flight techniques, 5,6 the timereversal technique can be applied to most solids without any prior knowledge of acoustic properties. However, many human-machine interfaces prefer "touch" sensing than impact localization, because touch is perceived as a more userfriendly interaction. 7,8 Indeed, some modern interaction modes such as "multitouch" 9 are difficult to achieve with "impacts," since it requires generating several impacts simultaneously on the tactile surface. Tactile objects based on an amplitude disturbed diffraction pattern methodRecently, an alternative method based on the crosscorrelation of selective absorption of the vibration modes has been presented. 10 This process is suitable for static contact localization. However, this process based on an absorption technique cannot address some particular uses such as stylus tip localization. In that case, contact creates more diffraction effect of the propagating acoustic waves than absorption. In this letter, we propose a tactile process based on an amplitude disturbed diffraction pattern ͑ADDP͒ phenomenon of an impulse acoustic wave. It expresses the following physical phenomenon: a human finger ͑or stylus͒ in contact with the objects affects the acoustic wave propagation in the solid. These disturbances depend on the finger position and the frequency of excited signal. With analysis and a calibration procedure of this variation, we can locate precisely the contact position.In the following examples, two emitters ͑piezoelectric transducers Pz27 type by Ferroperm, Denmark͒ transmit repetitive Lamb waves ͑period 1 ms͒ in t...

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Section: To Cite This Versionmentioning

confidence: 99%

Tactile objects based on an amplitude disturbed diffraction pattern method

Liu

Nikolovski

Mechbal

et al. 2009

Applied Physics Letters

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“…Touch sensitivity of solid surfaces can be achieved by the mode conversion of surface acoustic waves propagating on those surfaces at the contact area with human tissue, if the phase velocity of the surface acoustic wave is larger than the velocity of sound in tissue [1,2]. This concept has been realized at ceramic tiles by attaching two piezoelectric single phase transducers to the backside of the tiles, forming emitter and receiver of a surface acoustic wave transmission line.…”

Section: Introductionmentioning

confidence: 99%

P4.4 - Touch Sensitivity of Objects Based on Surface Acoustic Waves

Yu¹,

Kramer²,

Wieland³

et al. 2013

Proceedings SENSOR 2013

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“…Position sensors are used in many industrial applications to measure the linear displacement or angular positions of objects [1]. There are many kinds of position sensors, which are on various principles, such as piezoresistive method [2], capacitive method [3][4][5], infrared method [6], and SAW method [7], etc.…”

Section: Introductionmentioning

confidence: 99%

“…SAW has been used to make position sensors in macroscopic fields. For example, Matthew et al presented an acoustic position sensing system for large scale interactive displays [11]; another typical example is the economical SAW touch panel invented by Adler et al [7,12].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a Novel Surface Acoustic Wave Micro Position Sensor

Yang

Li²,

Shang³

et al. 2011

JEMAA

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In order to realize the micromation of position sensors, and extend the application area into micro scale, this paper designs a novel micro position sensor, Mace SAW (Surface Acoustic Wave) position sensor, which can be fabricated with MEMS technology. Its key components are IDTs (Interdigital Transducers) and reflective grooves. The structure and working principles of the sensor are introduced theoretically, and the manufacture process is then put forward

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An Economical Touch Panel Using SAW Absorption

Cited by 71 publications

References 4 publications

Tactile objects based on an amplitude disturbed diffraction pattern method

Tactile objects based on an amplitude disturbed diffraction pattern method

P4.4 - Touch Sensitivity of Objects Based on Surface Acoustic Waves

Design and Analysis of a Novel Surface Acoustic Wave Micro Position Sensor

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