Brake check handheld refractometer

Details Brake check handheld refractometer Brake check handheld refractometer

1998-06-15

1999-10-19

Font, Frank G.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356136, 356137, G01N 2141

Patent

active

059698080

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 on the reticle of the apparatus. 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 readings on the reticle.

REFERENCES:
patent: 3267795 (1966-08-01), Goldberg
patent: 4243321 (1981-01-01), Okuda et al.
patent: 4451147 (1984-05-01), Dobes et al.
patent: 4890916 (1990-01-01), Rainer
patent: 5355211 (1994-10-01), Thompson et al.

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