Brake check handheld refractometer

Optics: measuring and testing – Refraction testing – Prism engaging specimen

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Details

356136, 356128, G01N 2141

Patent

active

060347627

ABSTRACT:
A refractometric apparatus and method for monitoring the percentage of water in hydraulic fluids employ a temperature sensitive device allowing a user to obtain accurate and correct readings of various measured properties. In particular, the temperature sensitive member comprises a prism-wedge-mirror combination in conjunction with a bimetallic strip. The combination ensures the proper angular displacement of a light beam inside the refractometric apparatus and, therefore, the correct reading of a parameter to be measured.

REFERENCES:
patent: 3279309 (1966-10-01), Goldberg
patent: 3329060 (1967-07-01), Holleran
patent: 3447875 (1969-06-01), Goldberg
patent: 3625620 (1971-12-01), Goldberg
patent: 5355211 (1994-10-01), Thompson et al.
patent: 5617201 (1997-04-01), Kahre
patent: 5859696 (1999-01-01), Nicholas et al.

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