Optical spatial filter for two-dimensional speed measurement, position monitoring, and particle sizing

S. Bergeler; H. Krambeer; H. Ewald

doi:10.1117/12.692286

17 July 2006 Optical spatial filter for two-dimensional speed measurement, position monitoring, and particle sizing

S. Bergeler, H. Krambeer, H. Ewald

Proceedings Volume 6342, International Optical Design Conference 2006; 63421A (2006) https://doi.org/10.1117/12.692286
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada

Abstract

With two orthogonal spatial filters all directions of two-dimensional motion can be measured. A modification of the aperture function of the lattice allows an innovative measuring real time system for particle sizing and position monitoring. Every plane motion can be described with two velocity components. If two planar local filters are formed, then the directional characteristic can be changed, so that for all directions of object motion an evaluable output signal is generated. It is preferable to use orthogonal speed components because these produce minimal resultant error in the velocity vector. In our approach two-dimensional structured photo detector arrays are used as a spatial filter [1-3]. A modification of the aperture function of the lattice allows the realization of an innovative measuring system for particle sizing. The output signal is comprised of equidistant signal effacements, whose distances are dependent on the particle size [4-6]. What makes this method very interesting, particularly with regard to real time systems, is the possibility of pixel linking inside the sensor.

Citation Download Citation

S. Bergeler, H. Krambeer, and H. Ewald "Optical spatial filter for two-dimensional speed measurement, position monitoring, and particle sizing", Proc. SPIE 6342, International Optical Design Conference 2006, 63421A (17 July 2006); https://doi.org/10.1117/12.692286

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KEYWORDS

Sensors

Spatial filters

CMOS sensors

Particles

Particle sizing

CCD image sensors

Metals

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