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结合空间一维可展开桁架结构特点,基于四象限探测器光斑中心位置检测原理,提出以准直激光束为测量基准的空间一维可展开桁架结构精度测量方法.应用该方法可以实现对空间一维可展开桁架各构架单元的扭转角、横向偏移量、纵向偏移量及桁架直线度装配精度的测量.提出四象限探测器二维平面标定方法,将探测器的工作范围扩大到3 mm×3 mm,探测器的测量精度提高到0.05 mm.运用设计的基于四象限探测器的激光准直测量方法对空间一维可展开桁架进行了精度测量实验,得到桁架各刚性框架的最大扭转角为0.133 3°,最大横向偏移量为1.200 8 mm,最大纵向偏移量为1.299 3 mm,桁架的直线度误差为1.090 6 mm,验证了所提出的空间一维可展开桁架精度测量方法的有效性.
Combined with the characteristics of the one-dimensional expandable truss structure in space, based on the detection principle of four-quadrant detector spot center position, a one-dimensional expandable truss structure accuracy measurement method based on the collimated laser beam is proposed. By using this method, Dimensional torsional angle, lateral offset, longitudinal offset and truss straightness assembly accuracy of the truss frame units.A two-dimensional planar calibration method of four-quadrant detector is proposed, which extends the working range of the detector to 3 mm × 3 mm, the accuracy of the detector is improved to 0.05 mm. The accuracy of the one-dimensional expandable truss was experimentally measured by the laser collimation method based on four-quadrant detector. The maximum torsion angle Is 0.133 3 °, the maximum lateral offset is 1.200 8 mm, the maximum longitudinal offset is 1.299 3 mm, and the straightness error of the truss is 1.090 6 mm. The proposed method for measuring the accuracy of one-dimensional expandable truss space Effectiveness.