Development of a multi-view laser scanning sensor for reverse engineering

Abstract

For a long time the complete measurement of parts with complex structure and features has been a bottleneck of 3D measurement in reverse engineering. This paper presents a laser sensor that is mainly composed of three CCD cameras and four laser line projectors. With the principle of projecting laser planes from three directions and receiving the reflected stripes from the other three directions, the sensor can measure complicated parts from multi views. A concise approach for calibrating the sensor is proposed. The orientation of each laser plane is determined first. Then according to the orientation calibration points in the laser plane are generated as an array by controlling the CMM to let the laser plane intersect with a single-tooth target. The 2D coordinate system in the laser plane is established with the axes parallel to the line and row of the array. Thus the extrinsic calibration of the sensor is avoided. The 2D data in a laser plane can be obtained from a CCD image after the relationship between the laser plane and the CCD image is solved using the calibration points. Finally the 2D data in three laser planes are merged by transforming them into a world coordinate system. Experimental studies show that the developed sensor possesses good accuracy, and a complicated part can be measured as long as it can be accessed from at least one view.

Portable Light Pen 3D Vision Coordinate Measuring System- Probe Tip Center Calibration

“…There are two main types of measuring techniques: noncontact and contact ones. Representative non-contact PCMMs are laser or white light scanners [3], [4] and laser tracking systems (LTS) with CCD (Charge Coupled Device) cameras [5]- [9]. They often use interferometry or laser triangulation metrology to detect the surface form of the object or track the robot motion.…”

Self-calibration Method and Pose Domain Determination of Light-Pen in a 3D Vision Coordinate Measurement System

“…The traditional coordinate measuring machine (CMM) [1] cannot meet the online measurement requirements of some industrial sites due to its large size and limited measurement range. Indoor GPS, White light scanner [2,3], optical laser trackers [4][5][6] and other common measurement equipment [7,8] also have many shortcomings, such as low measurement efficiency, high cost, complex configuration, and poor portability. The shortcomings of modern measurement technology have limited the development of industry to a certain extent.…”

Self-Calibration Method and Pose Domain Determination of a Light-Pen in a 3D Vision Coordinate Measurement System

“…The traditional coordinate measuring machine (CMM) [1] cannot satisfy the online measurement requirements of some industrial sites due to its large size and limited measurement range. Indoor GPS, white light scanners [2,3], optical laser trackers [4][5][6], and other common measurement equipment [7,8] also have many shortcomings such as low measurement efficiency, high cost, complex configuration, and poor portability. The shortcomings of modern measurement technology have limited the development of industry.…”