JP5034056B2 - UEP visualization method and apparatus - Google Patents
UEP visualization method and apparatus Download PDFInfo
- Publication number
- JP5034056B2 JP5034056B2 JP2010189541A JP2010189541A JP5034056B2 JP 5034056 B2 JP5034056 B2 JP 5034056B2 JP 2010189541 A JP2010189541 A JP 2010189541A JP 2010189541 A JP2010189541 A JP 2010189541A JP 5034056 B2 JP5034056 B2 JP 5034056B2
- Authority
- JP
- Japan
- Prior art keywords
- uep
- anode
- indicator
- cathode
- ship model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Description
本発明は、船舶模型から発生するＵＥＰ(Underwater Electric Potential)を可視化するＵＥＰ可視化方法及び装置に関する。 The present invention relates to a UEP visualization method and apparatus for visualizing UEP (Underwater Electric Potential) generated from a ship model.
電解溶液中にイオン化傾向の異なる２つの金属が存在すると、当該２つの金属間に電位差が生じ、水中電界が発生する。これを船舶について見ると、船体(例えば鋼)とプロペラ(例えば銅)とが海水中(すなわち電解溶液中)に存在するため、船体とプロペラとの間に電位差が生じ、水中電界が発生する。この電位差又は水中電界を一般にＵＥＰという。 When two metals having different ionization tendencies exist in the electrolytic solution, a potential difference is generated between the two metals, and an underwater electric field is generated. If this is seen about a ship, since a hull (for example, steel) and a propeller (for example, copper) exist in seawater (that is, in an electrolytic solution), a potential difference is generated between the hull and the propeller, and an underwater electric field is generated. This potential difference or underwater electric field is generally referred to as UEP.
イオン化傾向の大きい船体の金属は陽イオンとなって海水中に溶け出すため、船体の金属は腐食する。この腐食を防止するための対策として、流電陽極方式又は外部電源方式といったカソード(陰極)防食が従来から知られている。流電陽極方式は、船体の金属(例えば鋼)よりも卑となる金属(イオン化傾向の大きな金属、例えば亜鉛)を犠牲陽極として船体に装着することにより、船体の腐食を防止する方式である。外部電源方式は、船底に取り付けた不溶性陽極(例えば白金陽極)から強制的に電流を流し、船体電位を一定に保つことにより、船体の腐食を防止する方式である。いずれの方式でも、海水中に腐食電流又は防食電流が流れ、ＵＥＰが発生する。 The metal in the hull, which has a high ionization tendency, becomes cations and dissolves in the seawater, so the metal in the hull corrodes. As a countermeasure for preventing this corrosion, a cathode (cathode) anticorrosion such as a galvanic anode method or an external power supply method has been conventionally known. The galvanic anode method is a method of preventing corrosion of the hull by mounting a metal (eg, metal having a high ionization tendency, such as zinc) that is lower than the metal (eg, steel) of the hull on the hull as a sacrificial anode. The external power supply system is a system that prevents corrosion of the hull by forcibly flowing a current from an insoluble anode (for example, a platinum anode) attached to the bottom of the ship and keeping the hull potential constant. In any method, a corrosion current or an anticorrosion current flows in seawater, and UEP is generated.
下記特許文献１は、ＵＥＰの低減を目的とし、「複数の犠牲陽極のうちの少なくとも１つの犠牲陽極に対して少なくとも１つの陰極を近接して配置してなる」ＵＥＰの低減法を提案している。 The following Patent Document 1 proposes a method for reducing UEP for the purpose of reducing UEP, which is “consisting of at least one cathode disposed close to at least one sacrificial anode among a plurality of sacrificial anodes”. Yes.
船舶から発生するＵＥＰを低減するにあたっては、船舶付近にＵＥＰがどのように発生しているかを把握することが重要である。しかし、目に見えないＵＥＰを把握するのは困難である。ＵＥＰセンサによる計測は、局所的なＵＥＰを知るには適するが、船舶付近のＵＥＰを全体的に把握するには不向きである。そこで、本発明者は、船舶模型を用いて、その付近のＵＥＰを全体的に把握することを目指して研究を重ねた。 In reducing UEP generated from a ship, it is important to grasp how UEP is generated near the ship. However, it is difficult to grasp the invisible UEP. The measurement by the UEP sensor is suitable for knowing the local UEP, but is not suitable for grasping the UEP near the ship as a whole. Therefore, the present inventor conducted research for the purpose of grasping the UEP in the vicinity thereof using a ship model.
本発明はこうした背景の下でなされたものであり、その目的は、船舶模型から発生するＵＥＰを可視化することができるＵＥＰ可視化方法及び装置を提供することにある。 The present invention has been made under such a background, and an object thereof is to provide a UEP visualization method and apparatus capable of visualizing UEP generated from a ship model.
本発明の第１の態様は、ＵＥＰ可視化方法である。この方法は、ｐＨ指示薬を含む液体に船舶模型を浮かべる又は潜らせることで、前記船舶模型周辺のＵＥＰを可視化することを特徴としている。 The first aspect of the present invention is a UEP visualization method. This method is characterized in that the UEP around the ship model is visualized by floating or submerging the ship model in a liquid containing a pH indicator.
第１の態様の方法において、前記ｐＨ指示薬がＢＴＢ液であるとよい。 In the method of the first aspect, the pH indicator may be a BTB solution.
本発明の第２の態様は、ＵＥＰ可視化装置である。この装置は、
ｐＨ指示薬を含む液体に浮かべた又は潜らせた船舶模型及びその周辺の画像を撮影するカメラと、
前記カメラの撮影画像における前記ｐＨ指示薬を含む液体の色の変化から、前記船舶模型周辺のＵＥＰを推定計算するデータ処理部と、
前記データ処理部での推定計算結果を基に前記船舶模型周辺のＵＥＰを表示する表示部とを備える。
The second aspect of the present invention is a UEP visualization device. This device
a camera that captures an image of a ship model and its surroundings floated or submerged in a liquid containing a pH indicator;
A data processing unit that estimates and calculates UEP around the ship model from a change in color of the liquid containing the pH indicator in the captured image of the camera;
A display unit that displays UEP around the ship model based on the estimation calculation result in the data processing unit.
第２の態様の装置において、前記ｐＨ指示薬がＢＴＢ液であるとよい。 In the apparatus according to the second aspect, the pH indicator may be a BTB solution.
なお、以上の構成要素の任意の組合せ、本発明の表現をシステムなどの間で変換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above-described constituent elements, or a conversion of the expression of the present invention between systems or the like is also effective as an aspect of the present invention.
本発明によれば、ｐＨ指示薬を含む液体に船舶模型を浮かべる又は潜らせるという新たな技術的思想により、船舶模型から発生するＵＥＰを可視化することが可能となる。 According to the present invention, it is possible to visualize UEP generated from a ship model by a new technical idea of floating or hiding a ship model in a liquid containing a pH indicator.
以下、図面を参照しながら本発明の好適な実施の形態を詳述する。なお、各図面に示される同一または同等の構成要素、部材等には同一の符号を付し、適宜重複した説明は省略する。また、実施の形態は発明を限定するものではなく例示であり、実施の形態に記述されるすべての特徴やその組み合わせは必ずしも発明の本質的なものであるとは限らない。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.
まず、本実施の形態の前提となる関係式について説明する。下記式１は、中性溶液に存在するイオンを示す。下記式２は、アノード(陽極)２１の金属の一例である亜鉛が溶けだす反応を示す。下記式３は、アノード(陽極)２１付近での反応を示す。下記式４は、カソード(陰極)２２の反応を示す。
（中性溶液） Ｈ2Ｏ → Ｈ+＋ＯＨ- …式１
（アノード） Ｚｎ → Ｚｎ2+＋２ｅ- …式２
（アノード付近） Ｚｎ2+＋２ＯＨ- → Ｚｎ(ＯＨ)2 …式３
（カソード） （１／２）Ｏ2＋Ｈ2Ｏ＋２ｅ- → ２ＯＨ- …式４
First, a relational expression that is a premise of the present embodiment will be described. Formula 1 below shows the ions present in the neutral solution. Formula 2 below shows a reaction in which zinc, which is an example of the metal of the anode (anode) 21, starts to dissolve. Equation 3 below shows the reaction near the anode (anode) 21. Equation 4 below shows the reaction of the cathode (cathode) 22.
(Neutral solution) H 2 O → H + + OH − Formula 1
(Anode) Zn → Zn 2+ + 2e − Formula 2
(Near the anode) Zn 2+ + 2OH − → Zn (OH) 2 Formula 3
(Cathode) (1/2) O 2 + H 2 O + 2e − → 2OH − Formula 4
溶液に含まれる水は、式１のように電離していることが知られている。溶液中に金属が存在すると式２のような化学反応が起きるため、アノード(陽極)２１が溶けだし金属イオンとなる。そして、その金属イオンが中性溶液中の水酸化物イオンと結びつき、アノード(陽極)２１付近では、式３のような化学反応が起きる。その結果、アノード(陽極)２１付近での水酸化イオンが減少し、水素イオン濃度が高くなるために、アノード(陽極)２１付近の溶液は酸性となる。 It is known that water contained in the solution is ionized as shown in Equation 1. When a metal is present in the solution, a chemical reaction as shown in Formula 2 occurs, so that the anode (anode) 21 is melted and becomes a metal ion. Then, the metal ions are combined with the hydroxide ions in the neutral solution, and a chemical reaction as shown in Formula 3 occurs near the anode (anode) 21. As a result, the hydroxide ions in the vicinity of the anode (anode) 21 decrease and the hydrogen ion concentration increases, so that the solution in the vicinity of the anode (anode) 21 becomes acidic.
一方、カソード(陰極)２２は、金属内で電子を受け取り、式４のような化学反応が起きる。その結果、水酸化物イオンが発生し、付近の溶液の水酸化物イオン濃度が高くなるために、カソード(陰極)２２付近の溶液はアルカリ性となる。すなわち、水素イオン濃度が高いと酸性溶液となり、水酸化物イオン濃度が高いとアルカリ性溶液となる。ｐＨ指示薬は溶液中のｐＨにより色が変化するものであり、一例としてＢＴＢ液を挙げると、図３に示すように、中性で緑５、酸性で黄６、アルカリ性で青７と色が変化する。なお、ｐＨ指示薬としては、ＢＴＢ液のような、酸性及びアルカリ性の双方（ｐＨ７の前後）を変色域に含むものが好ましい。 On the other hand, the cathode (cathode) 22 receives electrons in the metal, and a chemical reaction as shown in Formula 4 occurs. As a result, hydroxide ions are generated, and the concentration of hydroxide ions in the solution in the vicinity increases, so that the solution in the vicinity of the cathode (cathode) 22 becomes alkaline. That is, when the hydrogen ion concentration is high, an acidic solution is obtained, and when the hydroxide ion concentration is high, an alkaline solution is obtained. The pH indicator changes its color depending on the pH in the solution. As an example, the BTB liquid changes as shown in FIG. 3 with neutral green 5, acidic yellow 6 and alkaline blue 7. To do. In addition, as a pH indicator, what contains both acidic and alkaline (around pH7) in a color-change area | region like BTB liquid is preferable.
図１は、本発明の実施形態に係るＵＥＰ可視化方法の模式的説明図である。本実施形態では、透明な水槽１３にＢＴＢ液等のｐＨ指示薬１２が満たされていて、船舶模型１１をｐＨ指示薬１２に浮かべてある。なお、船舶模型１１は、実物の船舶と同材質で作られている。また、船舶模型１１は、ｐＨ指示薬１２に潜らせてあってもよい（潜水艦の場合）。また、図中に示すアノード(陽極)２１及びカソード(陰極)２２は、複数点在するうちの一つであり、実際には船舶模型１１のいろいろな位置にアノード(陽極)及びカソード(陰極)が存在する。図１に水中電界（ＵＥＰ）の流れ２０で示すように、船舶模型１１のアノード(陽極)２１からカソード(陰極)２２に向かって水中電界が流れている。 FIG. 1 is a schematic explanatory diagram of a UEP visualization method according to an embodiment of the present invention. In the present embodiment, a transparent water tank 13 is filled with a pH indicator 12 such as a BTB solution, and the ship model 11 is floated on the pH indicator 12. The ship model 11 is made of the same material as the actual ship. Further, the ship model 11 may be submerged in the pH indicator 12 (in the case of a submarine). Also, the anode (anode) 21 and the cathode (cathode) 22 shown in the figure are one of a plurality of points. Actually, the anode (anode) and the cathode (cathode) are located at various positions on the ship model 11. Exists. As shown by the underwater electric field (UEP) flow 20 in FIG. 1, an underwater electric field flows from the anode (anode) 21 of the ship model 11 toward the cathode (cathode) 22.
その結果、アノード(陽極)２１付近では、反応が進んだ指示薬(酸性)３０が検出され、カソード(陰極)２２付近では、反応が進んだ指示薬(アルカリ性)３１が検出される。以上の結果より、水中電界（ＵＥＰ）が可視化される。ｐＨが７（中性）から離れる方向の変化が速いほど、その位置のＵＥＰは大きいといえる。また、ｐＨの極大点又は極小点は、アノード(陽極)又はカソード(陰極)の位置と推定することができる。 As a result, an indicator (acidic) 30 having progressed reaction is detected in the vicinity of the anode (anode) 21, and an indicator (alkaline) 31 having progressed reaction is detected in the vicinity of the cathode (cathode) 22. From the above results, the underwater electric field (UEP) is visualized. The faster the change in the direction away from pH 7 (neutral), the greater the UEP at that position. Further, the maximum or minimum point of pH can be estimated as the position of the anode (anode) or the cathode (cathode).
図２は、本発明の実施形態に係るＵＥＰ可視化装置の構成例を示す模式図である。船舶模型１１から水中電界が水中電界の流れ２０のように発生しているものとする。結果、水中電界の発生要因であるアノード(陽極)２１及びカソード(陰極)２２付近で、ｐＨ指示薬１２の色が変化し始める。そして、水槽内に設置されたカメラ４１（動画撮影が可能なカメラで、例えば高速度カメラ）によりリアルタイムで得られた色彩データが信号線４２を介してデータ処理部４０に転送される。データ処理部４０では、アノード(陽極)２１及びカソード(陰極)２２付近のＵＥＰが撮影画像におけるｐＨ指示薬の経時的な色の変化から数値化される（推定計算される）。そしてＵＥＰは表示画面４３のように表示される。その結果、ＵＥＰが３次元的に可視化可能になり船舶模型１１の異種金属により点在するアノード(陽極)２１及びカソード(陰極)２２を検出することが出来る。 FIG. 2 is a schematic diagram illustrating a configuration example of the UEP visualization apparatus according to the embodiment of the present invention. It is assumed that an underwater electric field is generated from the ship model 11 as a flow 20 of the underwater electric field. As a result, the color of the pH indicator 12 starts to change in the vicinity of the anode (anode) 21 and the cathode (cathode) 22 that are the factors that generate the underwater electric field. Then, color data obtained in real time by a camera 41 (a camera capable of moving image shooting, for example, a high-speed camera) installed in the water tank is transferred to the data processing unit 40 via the signal line 42. In the data processing unit 40, the UEP near the anode (anode) 21 and the cathode (cathode) 22 is digitized (estimated and calculated) from the color change of the pH indicator over time in the photographed image. The UEP is displayed as a display screen 43. As a result, the UEP can be visualized three-dimensionally, and the anode (anode) 21 and the cathode (cathode) 22 scattered by the dissimilar metals of the ship model 11 can be detected.
さらに、その色彩データにより得られた水中電界（ＵＥＰ）データから電流源を検出（推定計算）し、アノード(陽極)２１及びカソード(陰極)２２から発生している電流値を求め、電気映像法等の手法を用いて水中電界を外挿し、水中電界分布を表示する。 Further, a current source is detected (estimated calculation) from the underwater electric field (UEP) data obtained from the color data, and current values generated from the anode (anode) 21 and the cathode (cathode) 22 are obtained. The underwater electric field is extrapolated using a method such as the above to display the underwater electric field distribution.
以上、実施の形態を例に本発明を説明したが、実施の形態の各構成要素や各処理プロセスには請求項に記載の範囲で種々の変形が可能であることは当業者に理解されるところである。 The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way.
１１ 船舶模型
１２ ｐＨ指示薬
１３ 水槽
２０ 水中電界（ＵＥＰ）の流れ
２１ アノード(陽極)
２２ カソード(陰極)
３０ 反応が進んだ指示薬(酸性)
３１ 反応が進んだ指示薬(アルカリ性)
４０ データ処理部
４２ 信号線
４３ 表示画面
11 Ship Model 12 pH Indicator 13 Water Tank 20 Flow of Underwater Electric Field (UEP) 21 Anode (Anode)
22 Cathode
30 Indicator with advanced reaction (acidic)
31 Indicator with advanced reaction (alkaline)
40 Data processing unit 42 Signal line 43 Display screen
Claims (4)
前記カメラの撮影画像における前記ｐＨ指示薬を含む液体の色の変化から、前記船舶模型周辺のＵＥＰを推定計算するデータ処理部と、
前記データ処理部での推定計算結果を基に前記船舶模型周辺のＵＥＰを表示する表示部とを備える、ＵＥＰ可視化装置。 a camera that captures an image of a ship model and its surroundings floated or submerged in a liquid containing a pH indicator;
A data processing unit that estimates and calculates UEP around the ship model from a change in color of the liquid containing the pH indicator in the captured image of the camera;
A UEP visualization apparatus comprising: a display unit that displays UEP around the ship model based on an estimation calculation result in the data processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010189541A JP5034056B2 (en) | 2010-08-26 | 2010-08-26 | UEP visualization method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010189541A JP5034056B2 (en) | 2010-08-26 | 2010-08-26 | UEP visualization method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2012046060A JP2012046060A (en) | 2012-03-08 |
| JP5034056B2 true JP5034056B2 (en) | 2012-09-26 |
Family
ID=45901451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010189541A Active JP5034056B2 (en) | 2010-08-26 | 2010-08-26 | UEP visualization method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5034056B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005123101A (en) * | 2003-10-20 | 2005-05-12 | Toyota Motor Corp | Gas flow measurement method and device in fuel cell |
| JP4626458B2 (en) * | 2005-09-14 | 2011-02-09 | 株式会社島津製作所 | Reduction method of underwater electric field in ship protection. |
-
2010
- 2010-08-26 JP JP2010189541A patent/JP5034056B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012046060A (en) | 2012-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI778111B (en) | Supporting system for offshore wind turbine and protectin method thereof and catholic protection system and use thereof for protecting the supporting system | |
| Shi et al. | Simulating corrosion of Al2CuMg phase by measuring ionic currents, chloride concentration and pH | |
| Syrek-Gerstenkorn et al. | Sacrificial thermally sprayed aluminium coatings for marine environments: A review | |
| Hartt | 2012 Frank Newman Speller Award: Cathodic Protection of Offshore Structures—History and Current Status | |
| US20150198518A1 (en) | Cathodic protection reference cell article and method | |
| Hasan | Galvanic corrosion of carbon steel–brass couple in chloride containing water and the effect of different parameters | |
| Coelho et al. | The corrosion inhibition mechanisms of Ce (III) ions and triethanolamine on graphite—AA2024-T3 galvanic couples revealed by localised electrochemical techniques | |
| JP2016099280A (en) | Abnormality detection method for water bottom cable, water bottom cable and abnormality detection device for water bottom cable | |
| US9790601B2 (en) | Marine cathodic protection system | |
| JP2007132010A (en) | Corrosion detection method of inside of coating corrosion-protective body | |
| US20160326657A1 (en) | Corrosion protection system and pump device with the same | |
| Hong et al. | Optimization of the cathodic protection design in consideration of the temperature variation for offshore structures | |
| JP5034056B2 (en) | UEP visualization method and apparatus | |
| JP5162759B2 (en) | Ship UEP reduction method and apparatus | |
| Knudsen et al. | Corrosion of Cathodically Polarized Thermally Sprayed Aluminum in Subsea Mud at High Temperature | |
| JP5217001B2 (en) | Hull UEP reduction method and apparatus | |
| JP7299467B2 (en) | hydrogen generator | |
| JPH10237682A (en) | System for controlling underwater current of ship | |
| JP2006029065A (en) | Oceanic steel structure | |
| Rhee et al. | Electrochemical evaluation of corrosion properties of aluminum alloy as a sacrificial anode for offshore structure protection | |
| JP5802988B2 (en) | Hull magnetism estimation apparatus and method | |
| WO2015108525A1 (en) | Cathodic protection reference cell article and method | |
| Mrdović et al. | Applications Impressed Current Cathodic Protection of the Ship Hull | |
| Hack | Designing cathodic protection systems for marine structures and vehicles | |
| CN104532259A (en) | Compound electrochemical device for condenser cathode protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120523 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20120530 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |