Electricity: measuring and testing – Electrolyte properties – Using a conductivity determining device
Patent
1979-11-15
1982-04-06
Karlsen, Ernest F.
Electricity: measuring and testing
Electrolyte properties
Using a conductivity determining device
33174A, 33200, 324 65R, G01N 2707, G01B 728
Patent
active
043238505
ABSTRACT:
In order to measure, for example, the radius of curvature of a soft contact lens, the lens is mounted in a bath of the electrolyte and supported at its periphery on a tubular support. A probe movable along an axis has two electrodes mounted on it and the resistance or impedance between those electrodes and the mount is monitored; when the difference in these resistances or impedances equals a predetermined value, the probe is taken as being a predetermined distance from the lens and the position of the probe relative to the mount is measured by a transducer arrangement. The output from the transducer is converted to digital form and used to address a read-only-memory in which are stored values correlating the position of the probe along the axis with the radius of curvature of the lens.
REFERENCES:
patent: 4205452 (1980-06-01), Wichterle et al.
patent: 4212107 (1980-07-01), Mezzasalma
Dawson Peter
Phillips John H.
Karlsen Ernest F.
Kelvin Lenses Limited
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