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Nephelometer instrument

  • US 5,604,590 A
  • Filed: 02/06/1996
  • Issued: 02/18/1997
  • Est. Priority Date: 09/08/1994
  • Status: Expired due to Term
First Claim
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1. A nephelometer instrument capable of measuring the turbidity of a liquid having a turbidity up to about 10,000 NTU, said instrument comprising:

  • (a) a transparent sample cell for containing a liquid sample to be tested;

    (b) a light source for directing a light beam into said sample cell;

    (c) a first light detector positioned for receiving light scattered at right angles from a region in the sample cell illuminated by the light beam and producing a first signal;

    (d) a second light detector positioned for receiving forward-scattered light through said sample cell and producing a second signal;

    (e) a third light detector positioned for receiving light transmitted through said sample cell and producing a third signal; and

    (f) a fourth light detector positioned for receiving back-scattered light from said sample cell and producing a fourth signal, and(g) means for calculating turbidity with an algorithm wherein said first signal is in the numerator and said second, third and fourth signals are in the denominator.

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