Fluid optical density (opacity) probe

Details Fluid optical density (opacity) probe Fluid optical density (opacity) probe

1986-04-07

1987-08-25

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250575, 356437, 356438, G01N 2101, G01N 2159

Patent

active

046889434

ABSTRACT:
An apparatus and method for determining the extinction of laser light through a fluid is disclosed. The fluid is passed in a conduit having a light transmissive window. A laser beam having intensity I.sub.1 is passed through the window into the fluid. A prong shaped probe having first and second probe sections is disposed in the fluid flow. The first probe section includes a beamsplitter at a distance d.sub.1 from the window for redirecting a portion of the beam onto a first photodiode array, to determine the beam intensity I.sub.2. The remaining portion of the beam tranverses a distance d.sub.2 and is directed through a prism onto a second photodiode array to determine its intensity I.sub.3. Based on the intensities I.sub.1, I.sub.2 and I.sub.3 and given d.sub.1 and d.sub.2, the extinction values E.sub.1 and E.sub.2 may be calculated. Fluid optical density may then be determined as a function of the extinction.

REFERENCES:
patent: 4017193 (1977-04-01), Loiterman
patent: 4290695 (1981-09-01), Schmitt

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