.~ By light interference detector (e.g., interferometer)
DEFINITION
Classification: 356/35.5
By light interference detector (e.g., inter-ferometer):
(under subclass 32) Subject matter including means responsive to an interference pattern produced by the interaction of coherent light waves with the stressed article or material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4.5, for light interference measurement of displacement or distance over large distances.
28.5, for light interference measurement of velocity.