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A real-time straightness measurement method for two-dimensional long guide rails is introduced based on the current measurement principle and status, combined with the requirements of existing work and the characteristics and performance of laser geometry measurement systems. The system uses a collimated laser beam as a reference line and outputs displacement values instead of angle values using coordinate data obtained from a dual two-dimensional PSD. Therefore, real-time measurement of intermittent guide rail straightness can be achieved. In addition, the system only has an output optical path and no return optical path, making the adjustment of the optical path much easier than that of a laser interferometer. When the 2D PSD fixed on the rail slider moves along the rail, the position data of the light spot will be transmitted to the terminal through the Bluetooth module. After inputting the position information, the software will automatically draw the 2D straightness curve of the rail. The reliability of this method was verified through experiments on a high-precision displacement platform. At the same time, while meeting the accuracy requirements, it is simple and practical, improving measurement efficiency, and providing a new way to improve measurement accuracy.
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