为了解决与角度测量有关的计量问题,常常采用一个坐标和两个坐标的自准直光管来检验物体垂直于自准直光管光轴(准直轴)的一个或两个轴的位置。同时,在许多场合还必须检验物体相对于自准直光管光轴(扭转轴)的迥转,也就是需要检验物体相对于三个彼此 In order to solve the measurement problem related to angle measurement, a coordinate and two-coordinate self-collimating light pipe is often used to test the position of the object perpendicular to one or two axes of the self-collimating light pipe axis (collimation axis). In the meantime, on many occasions, it is also necessary to check the rotation of the object with respect to the optical axis (torsion axis) of the self-collimating light tube, that is, to check the relative rotation of the object with respect to each other