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3 June 2005 CMOS sensor arrays as optical spatial filter
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A modified opto-electronic method for the determination of velocity, direction of motion and particle size is presented. This method is based on the use of two-dimensional structured photo detector arrays like CMOS-sensors. The principle of measurement utilised is the optical spatial filtering method, which is in widespread use in industrial speed indicators. This technique possesses some interesting advantages such as the use of incoherent light and simplicity of the optical and mechanical set up. In comparison to CCD sensors, new two-dimensional CMOS sensor arrays with direct pixel access allow a faster read out of sub frames. Another advantage of these sensor types is the possibility to realise several spatial filters simultaneously. New more effective measuring procedures can be realised. For instance with two velocity components you are able to describe every plane motion of an object. Thus the determination of direction is made possible. Furthermore, a novel method to determine the particle size by application of a spatial filter can be realised. The possibility of linking pixels inside the sensor (hardware design) makes these spatial filtering methods very interesting particularly with regard to real time systems.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Bergeler and H. Krambeer "CMOS sensor arrays as optical spatial filter", Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005);


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