18 June 2007 Designing a new optical sensor using wide band speckle patterns
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Abstract
The basic elements of the optical computer mouse (OCM) are; a light emitting diode (LED), image acquisition system (IAS) which acquires images via the lens and a digital signal processor (DSP) to implement the algorithm to determine direction and distance of motion. Here, we describe the light speckles produced from different colour LEDs to design and implement a new optical computer mouse. The speckle pattern will be used also to determine the velocity of the device relative to the surface it slides on it. The most important and critical property of speckles is their average diameter, which is independent of the type of the surface being illuminated by coherent (He-Ne laser and diode laser) or partially coherent light (LEDs). The average diameter of a speckle pattern is function of the diameter of the illuminated area of the surface, the distance between the surface and the detector, and the wavelength of the used light. In this work, we replaced the laser source by a small powerful white light lamp with different optical coloured filters and studying the resulting coloured speckle patterns to investigate the effect of different wavelengths on the velocity of the device relative to the surface it slides on it.
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Hatem El Ghandoor, Hatem El Ghandoor, Ashraf F. El Sherif, Ashraf F. El Sherif, M. Darwish, M. Darwish, } "Designing a new optical sensor using wide band speckle patterns", Proc. SPIE 6616, Optical Measurement Systems for Industrial Inspection V, 66161G (18 June 2007); doi: 10.1117/12.724870; https://doi.org/10.1117/12.724870
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