SHEN Jing-shi,ZENG Xiao-dong,LI Wei,JIANG Ming-shun.An FBG acoustic emission source locating system based on PHAT and GA[J].Optoelectronics Letters,2017,13(5):330-334 An FBG acoustic emission source locating system based on PHAT and GA Author Name Affiliation SHEN Jing-shi  School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China Shandong Institute of Space Electronic Technology, Yantai 264000,China  ZENG Xiao-dong  School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China  LI Wei  Shandong Institute of Space Electronic Technology, Yantai 264000,China  JIANG Ming-shun  School of Control Science and Engineering, Shandong University, Jinan 250061, China  Abstract:       Using the acoustic emission locating technology to monitor the health of the structure is important for ensuring the continuous and healthy operation of the complex engineering structures and large mechanical equipment. In this paper, four fiber Bragg grating (FBG) sensors are used to establish the sensor array to locate the acoustic emission source. Firstly, the nonlinear locating equations are established based on the principle of acoustic emission, and the solution of these equations is transformed into an optimization problem. Secondly, time difference extraction algorithm based on the phase transform (PHAT) weighted generalized cross correlation provides the necessary conditions for the accurate localization. Finally, the genetic algorithm (GA) is used to solve the optimization model. In this paper, twenty points are tested in the marble plate surface, and the results show that the absolute locating error is within the range of 10 mm, which proves the accuracy of this locating method. Hits: 4086 Download times: 0 View Full Text    Download reader