碩士 / 國立中山大學 / 海洋環境及工程學系 / 87 / Abstract
The aim of designing a prototype underwater inspection system for sheet-pile wharf is to inspect the dents cracks or breaks. If merchant vessels try to park to the pier, its body may hit sheet pile and cause some damage when taking turning or under improper control.
Divers with their hands or eyes usually did routine check of Sheet pile. However, there are some disadvantages. First of all, the effect of manual photo taking is limited by the turbidity of the water. Secondly, without any accident witness, it is very hard to know whether damage have happened to the sheet pile, consequently, this may threat the safety of human life and pier. Thus, developing an underwater inspection system is needed for Sheet-Pile Wharf maintenance. And following by divers examining and photo taking if some problem was found.
The research used laser and camera to form an integrated inspection system. To simulate the inspection process of Sheet-Pile Wharf, indoor trough was used for the experiment; the laser-scanning image can be processed to draw a 3-dimensional map of an object. The accuracy and error of the inspection process are also discussed. In addition, the turbidity of water of the harbor is measured and simulated in order to realize the practicability of prototype of underwater inspection system. The result shows that best object identification ability is 2 cm when the distance from inspection system to the object is 60 cm and the turbidity is under 0.5 NTU. We can obtain similar resolution when the distance above is shorten to 30 cm and the turbidity is 3.84 NTU. Therefore, Shortening the inspecting distance can solve the problem when water is turbid.
| Identifer | oai:union.ndltd.org:TW/087NSYSU282016 |
| Date | January 1999 |
| Creators | CHENG SHIH-HO, 鄭世和 |
| Contributors | Shyue Shiahn-Wern, Wang Chau-Chan, 薛憲文, 王兆璋 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 80 |
Page generated in 0.0017 seconds