Turbidimeter signal processing circuit using alternating light s

Details Turbidimeter signal processing circuit using alternating light s Turbidimeter signal processing circuit using alternating light s

1990-12-03

1992-08-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356442, G01N 1506

Patent

active

051401681

ABSTRACT:
A turbidimeter includes a housing having a cavity with an inlet through which a fluid flows. Two emitters are alternately driven by an alternating signal having a given frequency to transmit modulated light beams through the fluid. Two detectors produce signals representing the intensity of scattered and unscattered light within the fluid. Each of these detector signals is processed to measure the level of the signal component at the given frequency. Such processing includes filtering and phase demodulataing the detector signals to produce a signal indicative of the levels of the component signals at the given frequency. The turbidity is calculated from the signal levels measured as each emitter is excited.

REFERENCES:
patent: 3775013 (1973-11-01), Simms
patent: 4131888 (1978-12-01), Galvin
patent: 4366384 (1982-12-01), Jensen
patent: 4981362 (1991-01-01), de Jong et al.
patent: 4999513 (1991-03-01), Ito et al.

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