US PATENT SUBCLASS 356 / 4.01
.~ With photodetection

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.~ With photodetection {11}
4.02  DF  .~.~> Of a simulation or test
4.03  DF  .~.~> Of focused image size or dimensions
4.04  DF  .~.~> Of degree of defocus
4.05  DF  .~.~> Of focal point search
4.06  DF  .~.~> Of differential amplitude at two source or detector distances
4.07  DF  .~.~> Of intensity proportional to distance
4.08  DF  .~.~> Of height relative to a light plane
4.09  DF  .~.~> Of light interference fringes {1}
5.01  DF  .~.~> Of pulse transit time {3}
5.09  DF  .~.~> Of frequency difference
5.1  DF  .~.~> Of CW phase delay {4}

DEFINITION

Classification: 356/4.01

With photodetection:

(under subclass 3) Subject matter that includes the generation of an electrical signal in response to light associated with the distance being measured.

(1) Note. This subclass includes first any apparatus or method that includes a generic capability applicable to any one of pulse, phase, or frequency ranging systems.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3.01+, for a system that involves triangulation, even though that term is not mentioned, but is evidenced by a baseline or trigonometric technique and contains either photodetection and/or the use of a projected light beam.

9+, for a system that uses neither a pro-jected beam nor photodetection.

372+, for distance measurement to define the dimensions of an

adjacent, as opposed to remote, article that may involve similar ranging techniques to any one point.

SEE OR SEARCH CLASS 342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), for the use of similar circuitry not requiring the same wavelength or radiation distinctions.

367, Communications, Electrical: Acoustic Wave Systems and Devices, for the use of similar circuitry not requiring the same wavelength or radiation distinctions.