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激光远场发散角是评价激光光束质量的重要指标,根据远场发散角的定义和国际惯例,实际工程应用中设计出全自动可变光阑来测量激光远场发散角。在测量时利用图像处理和一阶重心距算法计算光斑中心,使可变光阑中心与待测激光束中心对准。测试系统自动由小到大变化光阑孔径,同时用探测器测量透过的激光能量。对光阑孔径和通过光阑的能量进行曲线拟合,算出总能量为1/e2时光阑的孔径,即对应于该处的激光束宽,从而可计算得出激光远场发散角。上述测量过程是利用虚拟仪器技术来全自动实现的,该激光远场发散角测试系统经过了项目验收和实际工程检验。
Laser far-field divergence angle is an important index to evaluate laser beam quality. According to the definition and international practice of far-field divergence angle, a fully automatic variable diaphragm is designed to measure the far-field divergence angle of laser. In the measurement, the center of the spot is calculated by using the image processing and the first-order centroid distance algorithm so that the center of the iris is aligned with the center of the laser beam to be measured. The test system automatically changes the diaphragm aperture from small to large while measuring the transmitted laser energy with a detector. The aperture of the diaphragm and the energy passing through the diaphragm are curve fitted to calculate the aperture of the diaphragm at a total energy of 1 / e2, that is, the laser beam width corresponding thereto, so that the laser far-field divergence angle can be calculated. The measurement process is fully automated using virtual instrument technology to achieve the laser far-field divergence angle test system after the project acceptance and actual engineering inspection.