| Presentation | 2015-08-24 Influence of Noise Spatial Distribution on Ambient Noise Imaging with Acoustic Lens Kazuyoshi Mori, Hanako Ogasawara, Takenobu Tsuchiya, Nobuyuki Endoh, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, we built a 2nd prototype ambient noise imaging (ANI) system using the acoustic lens having a 2-D receiver array with 127 elements corresponding to a field of view 15 degrees horizontally by 9 degrees vertically, and it is possible to record 127 output signals of the 2-D array continuously. In this study, we investigated the influence of the spatial noise distribution on the target image obtained by ANI. Here, the noise sources in front of the target are called ‘front light’, and those in rear of the target are called ‘back light’. In November 10-14, 2014, targets arranged in the field of view were imaged, and the positions of noise sources were also measured in the 2nd sea trial at Uchiura Bay. In the front light, the received intensities of the target directions were greater than those of other directions due to the dominant target scatterings. Reversely, in the back light, the received intensities of the target directions were lower than those of other directions due to the dominant direct noises such as ‘silhouette’. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Ambient Noise Imaging / Acoustic Lens / Noise Spatial Distribution |
| Paper # | US2015-44 |
| Date of Issue | 2015-08-17 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2015/8/24(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Institute of Technology, Ookayama Campus |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater Acoustics, General(Co-Organization：The Marine Acoustics Society of Japan) |
| Chair | Yoichi Itoh(Nihon Univ.) |
| Vice Chair | Mami Matsukawa(Doshisha Univ.) / Nobuyuki Endoh(Kanagawa Univ.) |
| Secretary | Mami Matsukawa(Univ. of Electro-Comm.) / Nobuyuki Endoh(Univ. of Electro-Comm.) |
| Assistant | Shin-ichi Hatanaka(Univ. of Toyama) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Influence of Noise Spatial Distribution on Ambient Noise Imaging with Acoustic Lens |
| Sub Title (in English) | Preliminary Data Analysis for the 2nd Sea Trial in November of 2014 |
| Keyword(1) | Ambient Noise Imaging |
| Keyword(2) | Acoustic Lens |
| Keyword(3) | Noise Spatial Distribution |
| 1st Author's Name | Kazuyoshi Mori |
| 1st Author's Affiliation | National Defense Academy(NDA) |
| 2nd Author's Name | Hanako Ogasawara |
| 2nd Author's Affiliation | National Defense Academy(NDA) |
| 3rd Author's Name | Takenobu Tsuchiya |
| 3rd Author's Affiliation | Kanagawa University(Kanagawa Univ.) |
| 4th Author's Name | Nobuyuki Endoh |
| 4th Author's Affiliation | Kanagawa University(Kanagawa Univ.) |
| Date | 2015-08-24 |
| Paper # | US2015-44 |
| Volume (vol) | vol.115 |
| Number (no) | US-186 |
| Page | pp.pp.37-41(US), |
| #Pages | 5 |
| Date of Issue | 2015-08-17 (US) |