P.earson Survey

Pearson调查是什么意思？

Pearson调查是一个上面的地面调查技术，用于检测金属管道外部涂层的缺陷。它采用引入管道的交流电流（AC）信号并比较两个可移动地球接触之间的电位梯度。它被认为是用于定位埋地管道涂层的假期和缺陷的第一种成功技术之一。

该方法是由J.M. Pearson于1941年开发的，并以他命名;该方法的变化也在使用中。

365金博宝Troohlesspedia解释了Pearson调查

T.he Pearson survey is carried out by two survey operators separated by 6 to 8 meters, who make earth contact through aluminum poles or metal cleats that are fastened to their shoes. An alternating current of 1000 Hz is imposed on pipelines with thick film coatings or approx. 175 Hz for pipelines with thin film coating, using a transmitter which is earthed and connected to the pipeline.

接收机是发射机的频率and measures the signal received, which is the potential gradient between the two operators. A change in potential gradient results in a change in the signal intensity, indicating a defect. As the lead operator walks over the pipeline and approaches a defect, there is an increase in the intensity of the signal. The intensity will decrease as the lead operator walks away and will spike again when the rear operator walks by the same defect.

T.he defect can be pinpointed by reducing the distance between the operators.