Analysis of acoustic imaging using wide-spread infrasonic sensor network array

A kind of wide-spread sensor network array consisting of broadband infrasound microphones (0.001Hz~20Hz) which was used by observing and studying low-frequency atmospheric infrasonic waves was provided. Each unit of this network array was distributed in a large area, and could monitor the local infrasonic waves effectively. According to continuous observations and statistic analyses, it could be hard to analyzing and acquiring the exact information of infrasonic waves source from the random infrasonic array signals observed, for the reason that disturbance caused by influence factors, such as wind, temperature, turbulent flow and so on, which existed in atmosphere and in the long distance propagation paths of infrasonic waves which comes from some places of hundreds of kilometers away. Therefore, a method of Rainbow graph based on the acoustic imaging analyzing of array signals observed by the wide-spread sensor network array, which could indicate the amplitude and frequency of infrasonic waves varied in its propagation paths by the changes of colors in the Rainbow graph, was provided. Propagation laws of infrasonic waves and its sources information could be studied by this method. The wide-spread sensor network array and Rainbow graph method provided in this paper may propel the study of atmospheric infrasonic waves and its propagation laws.