Differential refractometer
US4952055A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Oct 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/0346
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.