Optical tracking and detection of particles by solid state...

Details Optical tracking and detection of particles by solid state... Optical tracking and detection of particles by solid state...

2006-06-20

2006-06-20

Lauchman, Layla G. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S336000, C356S317000, C356S318000

Reexamination Certificate

active

07064827

ABSTRACT:
A particle detector has a chamber defining a pathway that a target particle follows between an entry and an exit point, a solid-state energy source such as an LED, and a re-emission sensor. The energy source imparts energy to the particle between the two points, and the sensor includes an arcuate or multi-planar lens to focus energy re-emitted by the particle. The particle is identifiable by its re-emitted energy spectrum. A scanner re-directs the beam from a single energy source to track the particle between the entry and exit points. Alternatively, the energy source is a plurality of source elements that each scan the particle at a single position. Another embodiment is a chipscale detector system wherein energy source elements are disposed on a source layer, sensor elements are disposed on a sensor layer, and one or more target particles to be detected are retained on a capture layer disposed therebetween.

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Hecht, Eugene, “Optics”, 4thEd., Pearson Education, Inc. publishing as Addison Wesley, 2002, pp. 603-605 and Figure 13.21.

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