基于固定桥式三坐标测量机的数字水准系统校准研究

    A Calibration Method Based on Fixed Portal CMM for Digital Leveling Systems

    • 摘要: 现有的因瓦条码水准标尺校准装置结构复杂且空间要求高,导致此类装置非常稀缺,制约了相关研究的开展。为了研究数字水准系统综合误差及因瓦条码水准标尺误差的计量性能,研制了一个紧凑型校准装置,由固定桥式三坐标测量机、平面反射镜、激光干涉仪、数字水准仪构成,介绍了装置的实现原理及方法。以此装置进行了不确定度分析及实验对比,说明摄像头直读条码水准标尺分划误差与数字水准仪解码读数的差异。提出本装置可实现的条码水准标尺校准及数字水准系统综合误差校准的建议,对于支持相关仪器的校准和量值溯源研究具有重要意义。

       

      Abstract: The existing calibration devices for invar barcode leveling staff are complex in structure and require significant space, making such devices rare and limiting related research. To study the metrological performance concerning the comprehensive error of digital leveling systems and the errors of invar barcode leveling staff, a compact calibration device has been developed. This paper introduces the principles and methods of implementing the device, which consists of a fixed portal three-coordinate measuring machine, a planar reflecting mirror, a laser interferometer, and a digital level. Using this device, uncertainty analysis and comparative experiments were conducted to illustrate the differences between the division errors of the barcode leveling staff read directly by the camera and the decoded readings obtained by the digital level. Recommendations are proposed for the calibration of barcode leveling staff and the comprehensive error calibration of digital levelling systems using this apparatus. This is of great significance to support the calibration and traceability studies of related instruments.

       

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