US PATENT SUBCLASS 356 / 4.1
.~.~.~ Having different frequency sources

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

3  DF  RANGE OR REMOTE DISTANCE FINDING {9}
4.01  DF  .~ With photodetection {11}
4.09  DF  .~.~ Of light interference fringes {1}
4.1.~.~.~ Having different frequency sources

DEFINITION

Classification: 356/4.1

Having different frequency sources:

(under subclass 4.09) Subject matter that includes at least two light beams from the same or different sources, but which have different frequencies.