Document Type and Number:
Japanese Patent JPS4970649
Kind Code:
A
Abstract:
A dilatometer for measuring the linear coefficient of expansion of a specimen block wrung on a platen. The measurement is made by electronically comparing a set of fringes that are responsive to motion of the sample to a set of fringes that are responsive to motion of the platen. Each set of fringes is generated by interference between a reference light beam and a light beam which has twice traversed the distance to the surface whose motion is being monitored, the two traversals being along separate but parallel paths. Each of the two sets of fringes is generated at the surface of the main beam splitter by recombining beams which have been reflected from cube-corners so that there is no requirement for a separate, precisely aligned, output beam splitter.
More Like This:
Application Number:
JP11076373A
Publication Date:
July 09, 1974
Filing Date:
October 02, 1973
Export Citation:
International Classes:
G01B11/16; G01B9/02; G01N25/16; (IPC1-7): G01B9/02