Development of Eddy Current Test System for Fuel Element Based on LabVIEW

Fuel element plays an important role in high temperature gas-cooled reactor-pebble-bed mod-ule. For adjusting the fuel element precisely, an eddy current test system based on LabVIEW was developed to count the plumbago ball precisely and select the defective balls. The system was composed of the hardware circuit, the computer, the data acquisition card and relative softwares. The design of the excitation source, head amplifier circuit and the phase-sensitive detector was introduced in detail. The plumbago balls were counted and defects were tested by this system, and the results showed that the system is with good test capa-bility.