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二轴针台由一个东西轴和针轴(相当于南北轴)构成,加上显微镜的载物台(直立轴)实际上是一个三度空间可旋转的针台。二轴针台的南北轴可以任意旋转360°,空间中的任一条直线经过南北轴的旋转可以水平,任意面可以直立。转动东西轴和南北轴可以使空间中87％~1)的直线直立。四轴或五轴弗氏台不能直立或水平的面和线,在两轴针台上可以使其直立或水平。二轴针台采用分别直立二个光轴的办法来研究二轴晶的光率体方位。二轴针台还可以使晶体中所能见到的晶面或解理面直立,并且在赤平投影网上研究晶体光率体与结晶方位的关系。
The two-axis needle table is composed of a spindle and a needle shaft (equivalent to the north-south axis), and the microscope stage (upright shaft) is actually a three-space rotatable needle table. Two-axis needle Taiwan’s North-South axis can rotate 360 °, the space of any straight line through the rotation of the North-South axis can be horizontal, any surface can be upright. Rotation axis and north-south axis can make the space 87% ~ 1) straight line upright. Four-axis or five-axis Freesia can not be upright or horizontal surface and line, in the two-axis needle table can make it upright or horizontal. The two-axis needle stage adopts the method of respectively upright two optical axes to study the photometric body orientation of the biaxial crystal. Biaxial needle Taiwan can also make the crystal can be seen in the crystal plane or cleavage plane upright, and in the stereographic projection network to study the relationship between crystal volume and crystal orientation.