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Novel optical spatial filtering methods based on two-dimensional photodetector arrays

S Bergeler and H Krambeer

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In this paper, modified opto-electronic non-contact measuring techniques for the determination of velocity, direction of motion and particle size are presented. These techniques are based on the use of two-dimensional structured photodetector arrays such as CMOS sensors. The principle of measurement utilized is the optical spatial filtering method, which is in widespread use in industrial velocimeters.


PACS

42.79.Ci Filters, zone plates, and polarizers

85.60.Gz Photodetectors (including infrared and CCD detectors)

06.30.Gv Velocity, acceleration, and rotation

47.55.Kf Multiphase and particle-laden flows

47.80.-v Instrumentation and measurement methods in fluid dynamics

Subjects

Fluid dynamics

Electronics and devices

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 7 (July 2004)

Received 15 August 2003, in final form 7 May 2004

Published 16 June 2004



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