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魚体反射率測定における同時較正法
https://fra.repo.nii.ac.jp/records/2007727
https://fra.repo.nii.ac.jp/records/2007727c4a41cfd-ca2f-4779-9402-aadfe75b40e5
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2024-06-18 | |||||
| タイトル | ||||||
| タイトル | 魚体反射率測定における同時較正法 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | Simultaneous Calibration Method in Measurements of Target Strength of Fish | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 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 | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
宮野鼻, 洋一
× 宮野鼻, 洋一× 石井, 憲× 古沢, 昌彦 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In order to estimate the fish biomass density or the size of the fish by acoustic means, the target strength of the fish must be measured beforehand. In this measurement transmitting and receiving devices should be calibrated. But calibrated values may vary with components in water (e. g. air bubbles), as time passes. So the calibration must be done as simultaneously as possible with the target strength measurement. Usual calibration methods, however, are so timeconsuming that the measurement is not simultaneous with the calibration. Therefore the authors developed a simultaneous calibration method in target strength measurement. In this method a hydrophone is put between a projector and a target, and it receives both the direct wave and the reflected one. The target strength can be computed from the amplitude ratio of thus obtained two waves. The merits of this method are as follows. (1) As the calibration is simultaneous with the measurement, it does not require time and labor. (2) Calibration errors are very slight. (3) If a projector, a hydrophone, and a target are on a straight line, the directivity pattern of the projector need not to be considered. (4) Every projected sound level can be always monitored. On the other hand, restrictions of this method are as follows. (5) It needs a small omnidirectional hydrophone. (6) The distance from a projector to a hydrophone or to a target must be carefully determined, considering Q factor of the projector, the near field of the target, and the amplitude ratio of the direct wave and the reflected one. These method were examined experimentally and some measurements were performed on a standard reflector. | |||||
| 言語 | en | |||||
| 書誌情報 |
ja : 水産工学研究所報告 en : Bulletin of National Research Institute of Fisheries Engineering 巻 3, p. 187-193, ページ数 7, 発行日 1982-03 |
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| 出版者 | ||||||
| 出版者 | 水産工学研究所 | |||||
| 言語 | ja | |||||
| 出版者 | ||||||
| 出版者 | National Research Institute of Fisheries Engineering | |||||
| 言語 | en | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 0388-9718 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AN00332937 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | nrife_k_3_187 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010254363 | |||||
| 言語 | ja | |||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||
