Research On Thin Aluminum Process Parameters Of Pulsed Eddy Current Testing

Aluminum extrusion profiles are structures widely used in the solar photovoltaic power system,With the development of photovoltaic systems, its market demand is growing larger and lager, but the production is still lack of automatic detecting device, the necessary quality detecting work is still almost completed by manual work which causes lots of missing or wrong detection. Since automatic on-line detection method is used in aluminum extrusion detecting. This article focus on a non-contact detection method which designs the thin aluminum process parameters detection system with Pulsed eddy current method. The research includes the following aspects:(1) Optimization of Pulsed Eddy current sensor structure and size parameters. Using Comsol Multiphysics simulation software to research the probe shape and size parameters’ effect to eddy current. Finding the optimal shape and size parameters of the probe.(2) Optimization of Pulsed eddy current sensor excitation parameters. While keeping probe shape and size parameters unchanged, using optimize simulation analysis to the pulsed eddy current sensors corresponding incentive parameter and the lift-off height, to get the regular between various excitation parameters, lift-off height and the sensor’s output signal.(3) Design of the detection system and building of experiment platform. Designing a detection system to improve the signal to noise ratio, According to the process parameters characteristics to design corresponding system, it mainly includes the pulsed eddy current sensor module, signal conditioning module and signal analysis module. Meanwhile building experimental platform based on the corresponding detection system to verify the validity of the simulation results and test systems.(4) Establishing of quantitative relationships between characteristic signals and corresponding process parameters. Changing the through-hole and blind hole signal into high and low level signals, extracting features to get the linear relationship between rolling scar depth and the output voltage of eddy current sensor.(5) Application of pulsed eddy current in aluminum extrusion on-line detection system. Using MCU to count the hole’s number and build rolling scar depth detection system based on Lab VIEW to realize automatic on-line detection system, it can collect and analyze the signal of rolling mark depth in real time to get the depth specific values. So it can achieve the goal of depth detection effectively.