G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/49 (2006.01) G01N 21/53 (2006.01) G01N 21/85 (2006.01) G01N 21/84 (2006.01) G01N 21/94 (2006.01)
Patent
CA 2108909
An apparatus for optically detecting light-absorbing contami- nation in at least one particle of low optical-loss material comprises an optical integrating chamber for containing the particles. A laser for emitting a laser beam to illuminate the particles is mounted in the plane of rotation of a rotating mir- ror such that the laser beam scans in a fan scan. A scanning assembly is mounted in optical alignment with the laser for reflecting the la- ser beam and for causing the laser beam to scan the particles in the optical integrating chamber. A fo- cusing assembly is mounted in opti- cal alignment with the laser For fo- cusing the scanning laser beam on- to the particles in the chamber, the focusing assembly operating in conjunction with the scanning as- sembly so that light from the laser beam is reflected from the particles and is repeatedly scattered onto the interior walls of the integrating chamber. A light sensing assembly is mounted on the integrating chamber for receiving the repeatedly scattered light from the interior walls of the integrating chamber and for generating a signal indicative of the intensity of the repeatedly scattered light. A decrease in the intensity of the repeatedly scattered light is a function of the presence of light-absorbing contamination in the material.
Dreyfuss David Daniel
Livermore Robert Hubbard
Majeski John Joseph III
Palecki Eugene Francis
Simpson Thomas William III
Bennett Jones Llp
E. I. Du Pont de Nemours And Company
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