Design of Acoustic Emission Data Acquisition System of Wood Damage

The acoustic emission (AE) signal of wood damage is a kind of weak and highfrequency signal. Hardware circuit design and software programming are necessary for the acoustic emission data acquisition. In order to carry out further analysis, it needs to be preprocessed. The preprocessing hardware system consists of preamplifier, filtering circuit, main amplification circuit and AD converting circuit. FPGA is considered as the main controller of the entire system in order to gather signals at a high speed. Data from AD convertor are written into FIFO (First In First Out) which is designed in FPGA in advance. Therefore, data can be kept in cache instead of losing them. Meanwhile, wireless transmission is applied to the system for distant detection. To sum up, the entire system can achieve the goal of distant detection of wood damage by gathering the acoustic emission signal whose frequency is from 100KHz to 300KHz and transmitting the processed data at a rate of 1MHz with wireless transmission module.