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Apparatus and method for measuring scattering of light in particle detection systems

  • US 4,286,876 A
  • Filed: 01/02/1979
  • Issued: 09/01/1981
  • Est. Priority Date: 01/02/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the scattering of radiant energy produced by particles for identification or the like of the said particles which comprises:

  • A. a source of radiant energy arranged to project a beam of radiant energy along a path,B. a sensing zone,C. means for moving particles through said sensing zone on an angle relative to said path to produce scattering of radiant energy from said beam,D. combined collecting and deviating means for receiving some of the scattered radiant energy and reflecting the same selectively with respect to different geometric portions of the scattered energy to confluence points at locations laterally spaced from said first axis, said collecting and deviating means comprisingi. an assembly of spherical mirror elements having their reflective surfaces facing the sensing zone, said assembly having a central first axis passing through said sensing zone,ii. each element being of a configuration and location to receive and collect radiant energy from a different geometric portion,iii. each element having an optical second axis, said element being oriented with respect to the first axis such that its own optical second axis diverges from the said first axis such that it deviates the radiant energy it collects by reflection along a third reflective axis which is twice the angle between the first and second axes to a point of confluence of the deviated radiant energy that is spaced laterally from the first axis,iv. the confluence point locations being spaced apart from one another in addition to being spaced laterally from the first axis andE. means responsive to the intensity of radiant energy at each location.

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