推导了各激光位移传感器相对位置的标定公式；通过分析传感器相对位置与弓高弦长的关系，得到了弓高和弦长的测量计算公式，进而得到了大圆直径的测量计算公式。
By analyzing the relations between relative positions of sensors and the bow altitude and chord length , the calculation formulas of the bow altitude and the chord length are o derived also .
弦长公式