The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2005
Filed:
May. 21, 2002
Gregory S. Retzlaff, Menomonee Falls, WI (US);
John R. Woodward, Hartford, WI (US);
Terry L. Dickey, Pflugerville, TX (US);
Karl King, Germantown, WI (US);
Gregory S. Retzlaff, Menomonee Falls, WI (US);
John R. Woodward, Hartford, WI (US);
Terry L. Dickey, Pflugerville, TX (US);
Karl King, Germantown, WI (US);
Hach Company, Loveland, CO (US);
Abstract
An apparatus for measuring tubidity of a liquid has a tubular lens of transparent material with an aperture for receiving the liquid. First and second first light emitters are positioned adjacent the tubular lens to produce two beams of light each diverging at a predefined angle and impinging the tubular lens. The tubular lens refracts the diverging beams of light from the two light emitters into separate collimated beams within the aperture. A first light detector positioned adjacent the tubular lens diametrically opposite to the first light emitter and a second light detector positioned diametrically opposite to the first light emitter and a second light detector positioned diametrically opposite to the second light emitter. Each light detector produces a signal indicating an intensity of light received from within the tubular lens and the signals are process to derive a turbidity measurement.