Triangulation ranging with photodetection, but with no projected beam:
(under subclass 3) Subject matter wherein the distance to any single remote target point is determined in accordance with the principles of triangulation, wherein at least one passive image of a target point (which may be formed by arbitrary target point illumination) forms at least one side of a triangle.
(1) Note. Triangulation involves, for example, establishing a triangle where one side (i.e., the base) and the angles, which the two other sides form with the base, are determined.
(2) Note. The target point may be an active omnidirectional beacon source or may be actively illuminated where the active beam does not form one side of the triangle measured.
(3) Note. Sequential views of a moving target with a known speed may comprise the target.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3.12, for photodetection remote from at least two source locations transmitting directed beams to be received by a photodetector.
9+, for triangulation with no projected beam and no photodetection. 372+, for distance measurement to define the dimensions of an adjacent, as opposed to remote, article that may involve triangulation to any one point.
SEE OR SEARCH CLASS
250, Radiant Energy,
201.6, for triangulation used to establish distance-related focus of the source onto a triangulating photodetector.
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.
396, Photography,
89+, where triangulation may be employed in the focus of a separate photos:graphic camera.
