US PATENT SUBCLASS 356 / 4.09
.~.~ Of light interference fringes


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.~.~ Of light interference fringes {1}
4.1  DF  .~.~.~> Having different frequency sources


DEFINITION

Classification: 356/4.09

Of light interference fringes:

(under subclass 4.01) Subject matter wherein the photodetection is in response to an interference pattern formed by the interaction of coherent light waves which relate to range by a fringe pattern or fringe count.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5.09, for a system that detects frequency of modulation to determine range where the beat frequency of a mixed or compared beam is not directly related to a coherent interference fringe count.

5.11, for phase change counting between known frequencies of modulation that are unrelated to coherent carrier mixing in the production of fringes.

5.15, for a system that demodulates a return beam by coherent or incoherent mixing in order to shift the return to a different IF operating frequency unrelated to counting of fringes.

28.5, for a system where frequency is detected from the mixing of coherent waves that produce a moving, interference pattern or just a difference frequency, which is related to velocity.