Programmable detector configuration for Fraunhofer diffraction p

Details Programmable detector configuration for Fraunhofer diffraction p Programmable detector configuration for Fraunhofer diffraction p

1988-11-01

1991-04-16

McGraw, Vincent P.

Optics: measuring and testing

For size of particles

By particle light scattering

356335, G01N 1502

Patent

active

050077376

ABSTRACT:
An intelligent laser diffraction particle sizing system is disclosed. A portion of the primary laser beam is directed by beam splitter into a calibration leg, modulated, and passed through a diffraction reticle. The known diffraction signature of the reticle is then recombined with the primary beam to pass through the particle field. Both the modulated calibration diffraction signature and the portion of the primary beam scattered by the particles are collected by the transform lens and detected at the back focal plane using an X-Y photodiode array. The detector array elements are grouped into variable geometry annular rings. The ring detectors are continuously centered around the beam using feedback from the X-Y position detector which monitors beam deflection.

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