激光扫描图像挠度位移测量方法改进

• 作 者: 阮文惠 黄珍 薛亚娣
• 机 构: 兰州文理学院数字媒体学院,
• 出 处: 激光杂志
• 发表日期: 2017年05期
• 关键词: 激光扫描 位移测量 挠度曲线 挠度值 激光束 仿真测试 图像扫描 激光光斑 光斑中心 中心线

针对传统测量物体挠度/位移方法的准确率低、误差率高,提出了激光扫描图像挠度/位移测量方法。首先对激光光斑图像进行预处理,通过色彩识别和阈值判定去除激光的衍射和散射,采用重心法调整光斑的灰度值,求解出激光束中心,然后根据多条激光束中心线与物体截面不同倾角和曲率值,采用最小二乘法拟合连续光滑的挠度曲线,测量得出更可靠的挠度值,最后试验结果表明,本文方法能够实现对物体挠度/位移更精确的测量。

Aiming at the low accuracy and high error rate of traditional method of measuring object deflection / displacement, a method of measuring deflection / displacement of laser scanning image is proposed. Firstly, the laser spot image is preprocessed, and the diffraction and scattering of the laser are removed by color recognition and threshold determination. The grayscale value of the spot is adjusted by the center of gravity method, and the center of the laser beam is solved. Based on the difference between the centerline of the laser beam and the cross section of the object Dip angle and curvature. The least square method was used to fit the continuous smooth curve and the more reliable deflection was measured. Finally, the experimental results show that this method can achieve more accurate measurement of the object deflection / displacement.