Aiming at the shortcoming of definition of traditional pipeline inspection tool is not high enough

a data acquisition system of three-axis magnetic flux leakage（MFL）inspection tool with high definition is introduced.Based on the principle of three-axis MFL

many Hall effect sensors are used as data acquisition components in the system

which are placed in three directions in every place at the periphery of inspection tool’s MFL detection module

in order to achieve the requirement of high definition.After MFL voltage signals are A/D transformed by the MCUs

the data is received and stored in solid state disk by the FPGA and PC—104.Experimental result shows that this system improves the definition of the inspection

and average testing error is less than 10 %

which proves the feasibility of the system.