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Research on calibration device of laser demarcation instruments

The accuracy of Laser Demarcation Instruments (LDIs) determines the efficiency and quality of subsequent measurements. After investigating the existing calibration method of LDIs, a new LDIs calibration device is designed in this paper based on image vision detection technology. The calibration method is convenient, high detection accuracy and high efficiency, and realizes digital calibration. This paper completes the overall design of the calibration system for LDIs, designs the mechanical structure of the image acquisition device and the working platform of the LDIs, and selects the relevant devices. The mechanical structure of the system is composed of an image acquisition device, a standard vertical line and a working platform for LDIs, which can calibrate the laser line width, horizontal tilt error of the laser line, and vertical tilt error of the laser line. Experiments were carried out, and the collected laser line images were processed by the computer to record and save the calibration results. The measurement uncertainty of the measurement results was evaluated.