Multi-channel near-field eddy current detection method for corrosion defects of inner wall of finned tube of air cooler

A multi-channel near-field eddy current detection method for corrosion defects of the inner wall of a finned tube of an air cooler comprises the following steps: determining the type and specification of the finned tube of the air cooler to be detected, and preparing corresponding detection equipment; manufacturing a calibration sample tube with artificial defects for detection; determining detection parameters of the multi-channel eddy current detector; determining the positions of channels of the multi-channel eddy current probe in the circumferential direction of the probe; adjusting the detection sensitivity of the detection equipment; the air cooler finned tube is detected, and an eddy current response signal of the air cooler finned tube is obtained; performing defect analysis and recording on the detection signal; and judging and processing the corrosion condition of the finned tube of the air cooler. According to the method, the corrosion condition of the finned tube bundle of the air cooler can be ra