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Difference in leveling-staff-zero-error is a crucial indicator in precision leveling. Traditional measurement methods need naked eye aiming many times and are affected by weather conditions and etc., which result in low measurement accuracy and less efficiency. In this paper, we design a novel dual-path optical coincidence imaging method for measuring of difference of leveling-staff-zero-error. The system consists of a two side-by-side level-staff positioning adjustment base and a micro-optical system. Firstly, the bases are adjusted to ensure both level-staffs have the same zero bottom surface. Then, it captures images of the same named strips on two measured level-staffs using the designed optical system to determine the difference in zero-error by position difference. Experiment results show an accuracy of approximately 1 μm of the proposed system. Compared to traditional methods, this approach offers a minimal error of 1.5 μm for zero-point differences, showcasing its advantages in accuracy, speed, and easy operation.
Zhu et al. (Wed,) studied this question.