Gregory D Retzlaff

US Patent:

7031865, Apr 18, 2006

Filed:

Aug 6, 2003

Appl. No.:

10/635057

Inventors:

Bruce M. Bathurst - Brookfield WI, US
Gregory S. Retzlaff - Menomonee Falls WI, US

Assignee:

AquaSensors LLC - Brookfield WI

International Classification:

G06F 19/00

US Classification:

702117, 374208

Abstract:

A sensor assembly. The sensor assembly includes a transducer, a memory element to store a plurality of transducer signatures, and a processor to identify the transducer using the transducer signatures, to process the environmental characteristic using the identified transducer signatures and the adaptive algorithm, and to output the processed environmental characteristics.

US Patent:

20040145742, Jul 29, 2004

Filed:

Nov 20, 2003

Appl. No.:

10/478226

Inventors:

Gregory Retzlaff - Menomonee Falls WI, US
John Woodward - Hartford WI, US
Terry Dickey - Pflugerville TX, US
Karl King - Germantown WI, US

International Classification:

G01N021/00

US Classification:

356/436000

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.