管道三维检测仪的激光光斑位敏探测技术

The detecting technology of the laser spot position in the underground pipeline detection instrument

通过摄像机采集激光光斑在成像屏上的图像并计算光斑坐标变化的方法,来检测地下管线的位置分布以及弯曲变化,具有精度高、响应灵敏等优点。在投影屏边缘处设计了五个固定孔作为尺度定标点,采集激光光斑在管道中移动的投影图像,采用多种数字图像处理方法,获得了五个固定孔投影椭圆的位置以及光斑的位置。此方法比以前检测光斑位置的方法,数据稳定可靠,有助于地下管道的三维分布测试的精度提高。

To detect the three-dimensional distribution of underground pipeline,the laser spot variation on imaging screen is collected by camera. The method is of higher precision and more sensitive response. Five fixed points at the edge of the imaging screen are designed as the key points of scale calibration. The position of the five projected light ellipse and the laser light spot is obtained by collecting the images of the laser projection screen and the image process method. The data is more stable and reliable,compared with the previous method which detects the position of the laser spot related to the entire image. The technology improves the detecting accuracy of the three-dimensional detective instrument of the underground pipeline.