US PATENT SUBCLASS 356 / 5.11
.~.~.~ Having multiple carrier or modulation frequencies

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}
5.1  DF  .~.~ Of CW phase delay {4}
5.11.~.~.~ Having multiple carrier or modulation frequencies {1}
5.12  DF  .~.~.~.~> Including an alternating reference path

DEFINITION

Classification: 356/5.11

Having multiple carrier or modulation frequencies:

(under subclass 5.1) Subject matter including more than one frequency of modulation or carrier frequency for the transmitted optical signal to further define the distance-proportional phases comparison.