Colorimeter

Details Colorimeter Colorimeter

1983-03-21

1985-05-28

Evans, F. L.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

356412, 356413, 356414, G01J 350

Patent

active

045197105

ABSTRACT:
A colorimeter for continuously monitoring the concentration of an ionic species in an aqueous solution comprises a source 30 of optical radiation, a flow cell 10 including three flow chambers 11, 12 and 13 interconnected so that a sample of the solution can pass through each flow chamber in succession, and photodetector devices 41, 42 and 43 positioned to respond to radiation transmitted through the solution in the flow chambers 11, 12 and 13, respectively. The lengths of the three flow cells are different from each other to provide a continuous real-time calibration check based upon photodetector responses to radiation transmitted through different quantities of the solution. Electronic circuitry interconnecting the radiation source 30 and the photodetector devices 41, 42 and 43 maintains the intensity of the radiation emitted by the source 30 at a substantially constant value.

REFERENCES:
patent: 3740155 (1973-06-01), Keller et al.
patent: 3743426 (1973-07-01), Steinberg
patent: 4066362 (1978-01-01), Carter
patent: 4099882 (1978-07-01), Andren et al.

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