A method for measuring and calibrating the spatial position vector of a point-projected optical probe

Abstract

The invention relates to a method for measuring and calibrating the spatial position vector of a point-projection optical measuring head. The method uses a point-projecting optical measuring head to measure a standard sphere on a Cartesian coordinate system measuring machine, and obtains coordinate information of seven light spots on the surface of the standard sphere. And obtain the reading value of the optical probe corresponding to the light point, use the spatial geometric relationship between the beam line vector and the surface of the standard sphere to establish a relationship equation, and solve the beam position vector information of the point projection optical probe. The advantage of this method is that it is easy to implement and has high measurement accuracy. The invention provides measurement principles, methods, steps, calculation formulas and the like.

Description

technical field [0001] The invention relates to a method for measuring and calibrating the spatial position vector of a point projection optical measuring head, which belongs to the technical field of measurement. Background technique [0002] Cartesian coordinate system three-coordinate measuring machine (CMM) is a measuring machine tool with three linear motion axes (X axis, Y axis and Z axis). Coordinate changes are generated through the movement of the three axes, and are realized by touching the probe and the workpiece. Sampling measurements of part surfaces. Traditional three-coordinate measuring machines usually use contact trigger probes; contact trigger probes are zero-position signaling probes. Before measuring parts, it is only necessary to calibrate the zero position of the trigger probe in the coordinate measuring machine (the measuring machine for the probe signal position coordinate value). [0003] In the three-coordinate measuring machine of the Cartesian ...

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Problems solved by technology

[0007] Another method of measuring and calibrating the beam direction of a point-projection optical probe has been carried out in China, that is, the method of measuring and calibrating the plane angle block; this method uses two planes that form a certain angle with each other as the measurement reference; the principle of this method is to use The spatial geometric relationship between the straight line vector and the plane is used to solve the information of the beam straight line vector; the measurement reference used in this method is a plane; the manufacturing precision of the plane reference is low, and it is difficult to achieve high-precision measurement calibration

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