Differential refractometer

Details Differential refractometer Differential refractometer

1988-10-03

1990-08-28

Evans, F. L.

Optics: measuring and testing

For optical fiber or waveguide inspection

356128, 356130, 356343, G01N 2141, G01N 2149

Patent

active

049520555

ABSTRACT:
A differential refractometer is described capable of measuring the refractive index charge, dn, of a transparent fluid corresponding to a change dc of the concentration of a solute in said fluid. The fluid is restricted to a fine capillary within a transparent material such as glass. Incident upon the capillary at an angle close to the critical angle is a fine light beam incident from said transparent material. The axes of the light beam and capillary intersect at a point within the capillary defining thereby a plane within which the refraction occurs. A position sensing device is placed to measure the displacement of the beam twice refracted during its passage through the capillary, said measure being used to generate a numerical value of the ratio dn/dc.

REFERENCES:
patent: 3619068 (1971-11-01), Broerman
patent: 3636360 (1972-01-01), Oishi et al.
patent: 4229105 (1980-10-01), Silverbage
patent: 4448691 (1984-05-01), Davis
patent: 4660974 (1987-04-01), Machler et al.
patent: 4710643 (1987-12-01), Schukler et al.
patent: 4756884 (1988-07-01), Hillman et al.

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