The system of measurement of underwater objects with the visual method

• Autorzy: Olejnik A.
• Języki publikacji: EN

Abstrakty

EN

This material presents the results of works implemented so far at the Department of Underwater Works Technology of the Polish Naval Academy in Gdynia within the project No. O N502 274039 focused on an attempt to prepare theoretical assumptions for the visual diagnostics system for underwater objects. The main accomplishments until now have been the preparation of a mathematical model allowing specification of dimensions of photographed underwater objects and construction of a prototype underwater photogrammetric camera together with software used in frame analysis. Moreover, the project involved carrying out experiments resulting in an initial assessment of the prepared method. Currently obtained results indicate that the measurement method under verification based on a light model constitutes a rough measurement method. Relative uncertainties regarding the measurement of linear quantities at average amount to 10%. What has a significant impact on the size of this error is the fact of defining nodal points in relation to figures and segments analysed in a given frame with the use of a cursor manually controlled with a computer mouse. This leads to the conclusion that ‘manual’ introduction of nodal points for the examined figures constitutes the weakest element of the verified measurement method and its modification will be the main objective of further research. It is expected that the CYKLOP camera and the application prepared for its operation will constitute a system for a technical assessment of underwater objects on the basis of visual research. This will be an important leap in relation to the quality of the visual examination of underwater objects, as the methods used so far allowed only qualitative assessment of objects. The constructed system will, on the other hand, enable obtaining both qualitative and quantitative data.

Słowa kluczowe

EN

underwater works technology; underwater photogrammetry; technical diagnostics

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2013
• Tom: Vol. 20, No. 4
• Strony: 313--317
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Olejnik A.

• Department of Underwater Works Technology Polish Naval Academy Śmidowicza Street 69, 81 – 103 Gdynia, Poland tel.: [phone], fax.: [phone]

Bibliografia

• [1] Cywiński, A., The analyse of laser sources for underwater distance measurement, Polish Hyperbaric Research No 1(34) 2011 pp. 55-66, 2011.
• [2] De Couet, H-G., Green, A., The manual of underwater photography, V.H. Hemmen Denmark 1989.
• [3] Olejnik, A., Method of determining focal length in photogrammetric camera, Polish Hyperbaric Research, No. 4(37), pp. 21-43, 2011.
• [4] Olejnik, A., The system of visual assessment of technical state of underwater objects, Advances in Mechatronic Systems, Mechanics and Materials, Trans Tech Publication, www.scientific.net/SSP.196.102.
• [5] Williams, J., Optical properties of the Sea, USN Institute, USA 1970.