为了对钢管的电磁超声测厚系统进行升级，在前期设计的磁化器与线圈分离的电磁超声测厚探头的基础上，提出了一种气浮式电磁超声测厚探头的设计方法，其原理是利用在探靴和钢管表面之间形成的气膜消除接触式摩擦，来实现对钢管的全浮动随动跟踪。通过理论分析，得出了钢管不同偏心率下气浮探靴的最大承载力；并通过搭建8通道电磁超声检测设备对钢管进行测厚试验，结果验证了该方法的有效性。理论分析和试验结果表明，相比传统的钢管电磁超声测厚方法，气浮式钢管测厚解决了探头的磨损严重问题，延长了探头的使用寿命，更好地满足了钢管在线检测的需求。

In order to adapt to the increasing production efficiency, the existing electromagnetic acoustic thickness measurement system for steel tube needs to be upgraded. On the basis of the preliminary designed transducer with the magnetizer and the testing coils separated, a gas floating designing method for the electromagnetic acoustic thickness measuring transducer is proposed. The gas film formed between the steel tube surface and the agent shoes is used to eliminate the contact friction, so as to realize the full floating servo tracking for the steel pipe. The maximum bearing capacity of the air floatation agent shoes under different eccentricity of the steel tube is obtained through the theoretical calculation. And the electromagnetic acoustic testing equipment with 8 channels was set up to measure the thickness of the steel tube. The accuracy of the measurement results shows that the method is effective. Theoretical analysis and experimental results show that, compared with the traditional method of electromagnetic acoustic thickness measurement for steel pipe, the gas floating designing method can solve the seriously wear problems of a long time contacting with the steel tube, and largely extend the service life of the probe, so as to meet the needs of the steel tube on-line detection preferably.