Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1993-02-03
1994-08-09
Turner, Samuel A.
Optics: measuring and testing
By polarized light examination
With birefringent element
356358, G01B 902
Patent
active
053371453
ABSTRACT:
A straightness interferometer system for determining the straightness of the relative movement of two machine parts is disclosed in which the required optical elements are combined into two optical components. In particular one optical component consists of a cold light source, a straightness reflector and a detector all combined together, and linked to a remote laser by a fibre optical cable. The other optical component is a beam diverging prism, e.g. a Wollaston prism together with a retroreflector. The advantage, particularly in a moving bed machine, is that the Wollaston prism can be mounted on the fixed spindle, and the light source, straightness reflector and detector are all mounted on the machine bed without the risk of errors occurring due to tilting movements of the bed as it moves.
REFERENCES:
patent: 1409339 (1922-03-01), Fischer
patent: 3790284 (1974-02-01), Baldwin
patent: 4711576 (1987-12-01), Ban
Extract from Tokyo Seimitus Catalogue.
Kim Robert
Renishaw Transducer Systems Limited
Turner Samuel A.
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