Liquid refractometer

Details Liquid refractometer Liquid refractometer

1984-10-15

1987-02-03

Evans, F. L.

Optics: measuring and testing

Refraction testing

Differential

356361, G01N 2141

Patent

active

046406158

ABSTRACT:
A liquid refractometer comprising a light source unit, a probe unit and a detection unit. The light source unit generates a beam of polarized mixed light composed of two coherent light waves that have been linearly polarized in directions at right angles to each other. The probe unit contains a polarization separation portion, a sample holding portion, a reference portion and a beam mixing portion. The polarization separation portion separates the mixed light beam back into the two polarized waves and directs one of the beams through the sample portion and the other beam through the reference portion. The mixing portion re-mixes the two waves after having passed through the sample holding portion and the reference portion. The detection unit receives the re-mixed light and measures the refractive index differences between the liquid sample and the reference portion. Fiber optics optically connect the light source unit, the probe unit and the detector unit.

REFERENCES:
patent: 4171915 (1979-10-01), Hesselink

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