Automatic calibration system for turbidimeters using a pulsing f

Details Automatic calibration system for turbidimeters using a pulsing f Automatic calibration system for turbidimeters using a pulsing f

1994-09-29

1995-11-14

Rosenberger, Richard A.

Optics: measuring and testing

Standard

356339, 356434, 356442, G01J 102

Patent

active

054671876

ABSTRACT:
An automatic calibration system is disclosed for an apparatus that measures the presence of s selected component in a test liquid sample. The system includes a transparent test liquid holder having an inlet and outlet for conducting a test liquid into and out of the holder. There is a transparent calibration element immersed in a test liquid in the holder and including a first sealed compartment that contains a full scale calibration standard and a second sealed compartment that contains a zero calibration standard. A pulsed flow of the test liquid is directed through the holder from the inlet to the outlet to reciprocate the calibration element within the holder. A light source is directed at the holder for establishing an incident beam of light that sequentially strikes the full scale standard, the zero standard, and a test liquid sample as the calibration element reciprocates through the holder. The light, emitted from the full scale and zero standards and the liquid sample is sensed and respective signals representative of the intensity of the emitted light are generated. The signals are processed to determine a calibrated measure of the selected component in the test liquid sample.

REFERENCES:
patent: 4158505 (1979-06-01), Mathisen et al.
patent: 4566798 (1986-01-01), Haas
patent: 4799799 (1989-01-01), Sapko et al.
patent: 4878755 (1989-11-01), Siegmund et al.
patent: 5120979 (1992-06-01), Mersch

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