为了满足100m~3km特长焦距参量的测试校准需求, 采用Talbot-Moiré条纹技术法, 设计了一套长焦测焦仪。针对影响仪器测量不确定度的系统参量, 分别设计了校准方法, 并对仪器测量不确定度评定结果进行了实验比对验证。结果表明, 校准后仪器测量不确定度评定为6.4%; 校准后的长焦测焦仪测量结果与刀口仪测量结果满足测量不确定度比对公式; 对比结果最大为0.64, 小于1; 长焦测焦仪测量不确定度评定合理。该研究验证了长焦测焦仪系统参量校准方法的可行性。

In order to meet the test and calibration requirements of 100m~3km extra-long focal length, a set of long focal length measurement instrument was designed based on Talbot-Moiré fringes. Aiming at the system parameters affecting the measurement uncertainty, different calibration methods were designed respectively. Experiments were carried out to verify the results. The results show that, after calibration, the measurement uncertainty is 6.4%. Measurement results of the long focal length measurement instrument after calibration, and knife-edge instrument meet the measurement uncertainty formula. The maximum comparison result is 0.64, less than 1. Uncertainty evaluation of the long focal length measurement instrument is reasonable. The research validates the feasibility of calibration methods for system parameters of a long focal length measurement instrument.