| Mass trans-cracks frequently appeared in runner blade of Francis Turbine seriously endangered the security of the waterpower station. The AE (acoustic emission) technique is a dynamic nondestructive examination way, the application of it can realize on-line monitoring to the cracks of runner blade of Francis turbine, accordingly when the hidden trouble occurs, it would be discoveried and consequently excluded timely. So to develop a suit of AE detecting system used in monitoring the cracks of runner blade is of great important to the safe running of waterpower station, the AE detecting system is fixed on the runner blade to realize the function of on-line monitoring to the cracks of runner blade.The existing DSP detecting system had realized the function of sampling AE signal and FIR filter, in this article, the wireless transmission modules based on Bluetooth technique were added, which accordingly realize the function of wireless transmission from DSP detecting system to PC. The resources of hardware and software were manufactured and designed to realize the integration of the detecting system.In the process of developing, in software, the AE parameters transmitting program of DSP detecting system were written, program modules were integrated. By using Windows API function, the receiving program that runs in the computer was developed, which had viewable interface and functions of distinguishing the serial number of channel, differentiating the types of parameters, real time display and saving received parameters to corresponding files. In hardware, the circuit board aims at converting voltage of four channels was made, all hardware modules were assembled in box. After the system had been accomplished, the experimentation of comparising transmission baud rate and breaking off pencil were made to validate the wireless transmission performance. The result achieved the anticipated purpose.
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