Nephelometer instrument
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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Abstract
A nephelometer instrument capable of measuring from zero to 10,000 NTUs. The instrument includes four light detectors, three of which are positioned such that they measure light scattered at specific directions by a liquid sample. The fourth detector measures light transmitted through the sample. A removable light filter is also included. The light beam is focused on the front surface of the sample cell.
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Citations
15 Claims
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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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A nephelometer instrument capable of measuring turbidity of a liquid having a turbidity up to about 10,000 NTU, said instrument comprising:
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(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; (g) means for deactivating said second, third and fourth light detectors; and (h) means for calculating turbidity with an alqorithm wherein said first signal is in the numerator and said second, third and fourth signals are in the denominator.
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Specification