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Portable particle analysers having plural detectors

  • US 5,043,591 A
  • Filed: 06/04/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 11/10/1987
  • Status: Expired due to Term
First Claim
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1. A particle analyser including a first scatter chamber, means for providing a sample of fluid in the form of a laminar flow through the first scatter chamber, a beam of radiation, adapted to intercept the sample at right angles to a direction of flow at a focal point of a first concave reflector, the first concave reflector being used to direct the radiation scattered by individual particles in the sample towards at least one radiation collector, means for converting the radiation collected into electrical signals for processing and analysis, and means for dumping the non-scattered radiation characterised in that an aperture in the first concave reflector leads to a second scatter chamber comprising a second concave reflector with a radiation collector located at its near focal point and positioned so that its far focal point is at the point of interception of the beam of radiation and the sample.

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