Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-03-24
1999-02-16
Westin, Edward P.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250574, 356334, G01N 2149
Patent
active
058723617
ABSTRACT:
A turbidimeter is described for measuring the turbidity of a liquid. The turbidimeter includes (a) a sample cell for the liquid to be tested, (b) an optical source such as a light-emitting diode (LED) for producing a light beam directed at the sample cell; (c) an optical detector, and (d) non-imaging optical concentrator located between the sample cell and the optical detector for concentrating light scattered by the liquid in the sample cell. The optical concentrator is preferably integral with the sample cell holder and it exhibits a sharp field of view which minimizes the effect of stray light in the instrument. The optical detector means produces a signal in response to the amount of scattered light it detects. The signal is converted to a turbidity value which is displayed. The turbidimeter can be battery powered and is small and compact.
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patent: 5237386 (1993-08-01), Harley
patent: 5506679 (1996-04-01), Cooper et al.
patent: 5589935 (1996-12-01), Biard
Hinterberger & Winston, "Use of a Solid Light Funnel to Increase Phototube Aperture . . . " Rev. of Scientific Inst. vol. 39 No. 8 p. 1717, Aug. 1968 .
Kolman Richard P.
Paoli Ernie R.
Wilcken Stephen K.
Edmundson Dean P.
Hach Company
Hanig Richard
Westin Edward P.
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