Online Industrial Color Measurement Methods And Systems Research

Color quality is one of the most important elements in related industrial quality control, in which color measurement is the key technology. However, the relatively unadvanced color measurement technology is influencing seriously the development of domestic color industry. Hereby, based on the deep study of the relevant theory of color measurement, an online color measurement system was designed with high precision, good stability, strong anti-jamming, and low cost.With the application of colorimetry and the comparison of classical color measurement methods, the general scheme was determined with the colorimetric principle of photoelectric integrating mode and the combination of digital computer technology and modern industrial controlling theory. Whereafter, the engineering design and testing experiments were described in details of optical system, colorimetric calibration, hardware and software.Considering the special requirements of online system for runtime and resource space, the functional modules were particularly marked out for the single-chip micro-computer system and the personal computer (PC) system. The single-chip micro-computer system sampled the color signals and sent them to PC, while controlled the auto-measurement and auto-calibration machinery via the PLC module. To ensure the reliability and stability of the data communication, the RS-485 electric interface was adopted in the system, and the corresponding communication protocols were effectively designed in the single-chip micro-computer. The software on PC is the control center of the whole online measurement system, which took charge of the data processing of colorimetric calculations and judgements, information storage, interface display, serial communication, result query and so on. On the basis of the modularization design of the PC software, several key techniques were detailed, such asthe solution of the system resources' problem by use of the multithreading and database technology.Several experiments were carried out to test and evaluate the related technical performances of this system, which showed excellent stability, repeatability, and accuracy of color measurement. Furthermore, on the results of the long-time continuous color measurement experiment indicated that the designed scheme of the on-line color measurement method and system is feasible and effectual. Finally, the technical aspects of this study were summarized, and then the existing deficiencies and the possible improvements of this system were prospected.