Turbidity sensor with the capability of regulating the intensity

Details Turbidity sensor with the capability of regulating the intensity Turbidity sensor with the capability of regulating the intensity

1995-05-25

1996-12-31

Epps, Georgia Y.

Optics: measuring and testing

By particle light scattering

With photocell detection

356442, 68 1202, 68 1227, 134113, 134 57D, G01N 2100, D06F 3300, B08B 300

Patent

active

055899358

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.

REFERENCES:
patent: 3561875 (1971-02-01), Ried, Jr. et al.
patent: 3736431 (1973-05-01), Childs
patent: 4003661 (1977-01-01), Yamano
patent: 4257708 (1981-03-01), Fukuda
patent: 4697925 (1987-10-01), Hyodo et al.
patent: 5172572 (1992-12-01), Ono
patent: 5291626 (1994-03-01), Molnar et al.
patent: 5444531 (1995-08-01), Foreman et al.
patent: 5446531 (1995-08-01), Boyer et al.

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