The Application of Fresnel Intergrals to the Study of Underwater Noise Sources
In this paper a sound imaging system is constucted to investigate the characteristics of underwater noise, especially that of moving objects. Space transformation of the sound field is performed by the Fresnel integral. It is shown how to calculate the Fresnel integral with the Fourier transformation, and the selection of parameters in the Fresnel integral is also presented. Three experiments are described in the paper: the sound image of a cross array with five elements, the sound image of a moving ship model and that of an underwater engine. The method of scanning in experiments is discussed. It is shown that the position of the main sources can be easily recognized from the sound images of measured objects.
KeywordsSound Source Measurement Plane Sound Field Source Plane Sound Image
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