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魚体の超音波反射指向性パターンおよび反射波形の変動に関する基礎的研究
http://hdl.handle.net/10232/14394
http://hdl.handle.net/10232/14394df913f57-6ff5-4032-82b5-2c5ed77d99b9
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
AN00040498_v43n2_p69-138.pdf (15.1 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2015-04-30 | |||||
| タイトル | ||||||
| タイトル | 魚体の超音波反射指向性パターンおよび反射波形の変動に関する基礎的研究 | |||||
| タイトル言語 | ja | |||||
| タイトル | ||||||
| タイトル | Fundamental Studies on the Variations in Scattering Patterns and Echo Shapes of Fish | |||||
| タイトル言語 | en | |||||
| 著者 |
山中, 有一
× 山中, 有一 |
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| 言語 | ||||||
| 言語 | jpn | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Echo sounder | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Scattering pattern | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Echo shape | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Interference | |||||
| キーワード | ||||||
| 主題言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Frequency analysis | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| 要約 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | In recent years, quantitative echo sounders are generalized to survey fish stocks. An echo integration method using fish target strength (TS) as principal parameter is investigated and improved the accuracy. On one hand, the estimation of individual fish which are determination of fish species or body length is incompletely. A great deal of effort has been made on this problem. What seems to be lacking, however, is direct information in the echo signals. Periodic change in scattering patterns and wave-form variation of reverberation are discussed in this dissertation, in order to obtain informations of an individual fish. Some basic experiments to observe the echo shapes and periodic changes in scattering patterns are described in Chapter 2. The results of these experiments are explained theoretically in Chapter 3. A period of changes in a scattering pattern can be applied to estimate the distance between two acoustic sources. In Chapter 4, an experiment with two steel balls, the distance between two acoustic sources was calculated from the periodic change of the scattering pattern by using an auto-correlation function. It was confirmed that the period of the carrier changed appreciably when the echo amplitude was cancelled due to interference. This phenomenon will be used to indicate a state of interference on wave form fluctuation. | |||||
| 内容記述言語 | en | |||||
| 要約 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | In experiments with eight species individual fishes, the echo pattern showed a periodic change which was estimated to be caused by interference. Also the period of the carrier fluctuated in the cancelled condition. In Chapter 5, the results of these measurements are described. The Spectrum of scattering patterns from individual fishes are analyzed in order to clarify the cause of periodic changes in dorsal aspect scattering patterns. Three species into target fishes were measured in three states, whole, without bladder, and skeleton. The power spectrum was calculated from scattering patterns which transformed to distance-amplitude coordinates from incidence angle-amplitude coordinates. The elemental patterns and power proportion of each frequency band were calculated by using convolution integration of the power spectrum and filter-function in the frequency region. Analysis shows that a relationship was observed between fish species, or fish figure, and the characteristics of the changing period. Chapter 6 contains a summary of this research and discussion about an application of information included in echo shape. | |||||
| 内容記述言語 | en | |||||
| 収録雑誌名 |
ja : 鹿児島大学水産学部紀要 en : Memoirs of Faculty of Fisheries Kagoshima University 巻 43, 号 2, p. 69-138, 発行日 1994-12-25 |
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| 作成日 | ||||||
| 日付 | 1994-12-25 | |||||
| 日付タイプ | Issued | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| ISSN | 0453087X | |||||
| NII書誌ID（雑誌） | ||||||
| 収録物識別子タイプ | NCID | |||||
| NC ID | AN00040498 | |||||
| 出版タイプ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| NDC | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 660 | |||||
| 公開者・出版者 | ||||||
| 出版者 | 鹿児島大学 | |||||
| 出版者言語 | ja | |||||
| 公開者・出版者 | ||||||
| 出版者 | Kagoshima University | |||||
| 出版者言語 | en | |||||
