Since the laser,emitted by the pulsed laser,is not continuous but has an adjustable repetition frequency,the marked straight line will be discrete if the scanning speed of the galvanometer is too fast.The resolution of human eye in the clear distance is about 0.1 mm,so the marked lines were divided into marked points with a pitch of 0.1 mm.The DDA algorithm was used to calculate the coordinates of each point in turn.Each point was scanned in turn through controlling galvanometer,and the stay for an appropriate time in each point make laser pulses fall on the each point.In this way,a continuous straight line can be marked.And the minimum waiting time depends on the repetition frequency of the laser and the number of laser pulses required for each point.Experiments show that this method can achieve the marking maximum speed in a given frequency,and the straight line is continuous,the depth of the line is in controllable.%由于脉冲激光器发出的激光不是连续的,而是具有可调节的重复频率,因此振镜的扫描速度太快会导致标记出的直线呈离散的点状.人眼在明视距离处的分辨率约为0.1 mm,将待标记的直线分解成间距为0.1 mm待标点,使用DDA算法依次计算出每一个待标点的坐标,控制振镜依次扫描过每个待标点,并在待标点停留适当时间,使每个待标点所在位置都有激光脉冲落在上面.依次扫描过直线上的全部待标点,即可标记出连续的直线;根据激光器设定的重复频率和每个待标点所需激光脉冲个数,可以计算出振镜在每个待标点的最短等待时间.实验表明,使用该方法可以使相应频率下的直线标记速度达到最大,标记出的直线连续,标记直线的深度可控.
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