Turbidity sensor with the capability of regulating the intensity of a light source
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United States of America Patent
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Dec 31, 1996
Grant Date -
N/A
app pub date -
May 25, 1995
filing date -
May 25, 1995
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A turbidity sensor is provided with two light sensitive components or elements. One light sensitive component is displaced from a light source, such as a light emitting diode, so that a fluid can pass therebetween. A second light sensitive component is disposed within a common compartment with the light source so that it can measure the intensity of light provided by the light source. The light source and the second light sensitive components can be individual elements, or chips, within a common component package. A regulator is provided to control the magnitude of current provided to the light source so that its light intensity can be regulated. In this manner, the intensity of light emitted by the light source, such as a light emitting diode, can be controlled regardless of the aging of the LED, the variability of LED characteristics and the temperature surrounding the LED. The constant light emission from the light source permits the other light sensitive component to be used as a reliable indication of the turbidity of a solution passing between the light source and the first light sensitive component.
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