High-speed scanning and overall imaging three-dimensional (3D) measurement method

Abstract

The invention relates to a visual inspection technology. In order to meet the requirements of fast and high-accurate surface three-dimensional (3D) topography online measurement and the detection requirements of a production line on intelligence, fastness, high accuracy and low cost, the invention adopts the technical scheme that: a high-speed scanning and overall imaging 3D measurement method comprises the following steps of: carrying out external modulation on a driving power supply by using a laser so as to control the output of a word line laser; rotating a multifaceted prism under the drive of a high-speed motor, wherein line-structured light outputted by the laser is reflected and projected to the surface of a measured object by the multifaceted prism; and placing a photoelectric detector at a position which is the limit position projected by the line-structured light during the rotating process of the multifaceted prism, carrying out exposure on an area-array CCD (Charge-Coupled Device) camera during the process that the line-structured light scans the whole area, and establishing a measurement model, wherein the 3D coordinate (xp, yp, zp) of the surface feature point of the measured object is obtained according to a formula by using an image coordinate (u[theta]p, v[theta]p) formed by the area-array CCD camera and [theta]p. The high-speed scanning and overall imaging 3D measurement method is mainly applied to the fast and high-accurate surface 3D topography online measurement.

Description

technical field [0001] The invention relates to visual detection technology, in particular to the measurement of spatial geometric features such as surface size, shape, curvature, and position, and in particular to a high-speed scanning overall imaging three-dimensional measurement method. Background technique [0002] In modern industrial manufacturing fields such as surface mount integrated circuit pins, printed circuit board solder paste, and micro-sized high-precision mechanical parts, the spatial geometric characteristics of the product's surface size, shape, curvature, and position directly affect the quality and reliability of the product. Therefore, higher requirements are put forward for the three-dimensional shape measurement of the product surface. Visual measurement technology is a comprehensive technology integrating modern technologies such as vision, optics, electronics, computer and automatic control. It has outstanding advantages such as non-contact, fast sp...

AI Technical Summary

Problems solved by technology

However, in order to realize the measurement of the overall three-dimensional shape, the cooperation of the displacement mechanism is required, and the measurement speed is slow, which cannot meet the requirements of online production measurement speed.

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