Abstract
The trend in human-machine interface technology is heading towards optical solutions for tracking and
movement detection. Especially, interactive touch screens and pads, in which the movement of the user’s
fingertips is detected and tracked, are of great commercial interest. The applications range from mobile phones
to laptops and PDA´s. However, the dynamics of scattered light from live tissue must be taken into account
when designing optical sensor systems for tracking e.g. fingertips in touch-applications. Especially, when using
coherent light sources, the statistics of the speckle-pattern originating from the scattering structure is of critical
importance for the sensor performance and has to be understood in details. We investigate theoretically and
experimentally the characteristics of the dynamics of backscattered speckle pattern generated by a human
fingertip and address the effects of an intermediate optically flat interface, between the fingertip and the
illuminating light source.
Original language | English |
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Journal | Proceedings of SPIE, the International Society for Optical Engineering |
Volume | 7726 |
Pages (from-to) | 772621 |
ISSN | 0277-786X |
Publication status | Published - 2010 |
Event | Photonics Europe 2010: Optical Sensing and Detection - The Square Conference Center, Brussels, Belgium Duration: 12 Apr 2010 → 16 Apr 2010 http://spie.org/x40293.xml |
Conference
Conference | Photonics Europe 2010 |
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Location | The Square Conference Center |
Country | Belgium |
City | Brussels |
Period | 12/04/2010 → 16/04/2010 |
Internet address |
Keywords
- Bio speckle
- Speckle interferometry
- Laser speckle