Turbidity sensor with improved noise rejection
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United States of America Patent
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Issued Date -
Mar 23, 2006
app pub date -
Sep 13, 2005
filing date -
Sep 16, 2004
priority date (Note) -
Abandoned
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Abstract
A turbidity sensor includes a sensor body, a primary illuminator, a scattered light detector and a bubble illuminator. The sensor body is disposed to contact a liquid sample. The primary illumination source is disposed to direct illumination into the liquid sample. The scattered illumination detector is disposed proximate a portion of the sensor body that is straight in at least one dimension, and the detector is configured to detect illumination from the primary illumination source that is scattered within the liquid sample. A bubble illuminator is disposed to direct illumination along the at least one dimension. Scattered light that originates from the bubble illuminator is detected by the scattered light detector and provides an indication of bubbles proximate the scattered light detector. Methods of filtering and selectively updating a running average of turbidity readings are also disclosed.
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