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介绍JSP-1型激光扫平仪发射装置的工作原理。为保证该装置在作业半径为120m范围内测平精度不超过1cm，探讨各种误差因素对激光测平精度的影响。分析了在远场条件下光衍射所引起的光讯号的能量分布，并用实验证实在300m远处该装置发出的激光信号仍能满足测平精度的要求。
Introduce the working principle of JSP-1 laser scanner. In order to ensure that the device within the operating radius of 120m leveling accuracy of not more than 1cm, explore the impact of various error factors on the laser leveling accuracy. The energy distribution of the optical signal caused by light diffraction under far field conditions was analyzed. Experiments show that the laser signal emitted by the device can still meet the requirement of leveling accuracy at a distance of 300m.