Research For Full-field Auto-Scanning Measurement System

According to the demand for the measurement of middle-size and small-size accessories during the developing process of modern measurement systems, and taking the camera, line structured laser, galvanometer and etc as carriers, and combining the calibration of line structured light vision sensor, the dissertation studies on the working elements, transforming model and system calibration of the full-field auto-scanning measurement system deeply theoretically and practically, trying to bring forward a creative method on calibration and measured dots transformation, and prove it through hardware designing and software programming. At last, through the measurement for real objects and the analysis for the errors, it's proved the precision of this theory. The main and creative work in the dissertation consists of the following aspects:1. Using the known calibration method for line structured sensor, and combining the analysis of the system transformation model, this paper built up the mathematical model of the CCD camera and compensated aberration error, and finished the calibration of camera and system initial state.2. This paper creatively brought up the 3D transformation model of the full-field auto-scanning measurement system. The initial state of line structured laser and the galvanometer was established after it finished the calibration of the camera using the method of line structured laser based on the planar grid target. The position of reflected laser plane when the galvanometer rotates each time was solved by using the angle rotated, and then a new method to get 3D coordinates was established.3. Develop the control software of the full-field auto-scanning system through which the hardware can be controlled, and then it can realize the functions like camera calibration, calibration of initial state or real measurement. The software can also make simple process of data, store the data and display themThis paper designed a new set that can measure the surfaces of the accessories in its view field by changing the angle between laser plane and galvanometer axis. The line structured laser can scan the full field of the camera by driving the laser plain motioning through the object space through a galvanometer. It makes the full-field auto-scanning function inside of the line structured laser sensor. This system is not only making it breaking away from the limit of the outer drive set, but also improving the speed and agility of measurement.The innovation of this paper is advancing the 3D transformation model of the full-field auto-scanning sensor and the calibration method of the system initial state by using the planar target.