Holography underwater inspection

E. Concalves, J. L.V. Rivera

Research output: Contribution to conferencePaperpeer-review


In this work, the under-water inspection processes are focused. The difficulties during the process and the quality of the image generated are the main concern for bodies in the ocean deep water. The holography is proposed as an under-water inspection process and its advantages and disadvantages are compared to the other more common used processes. The fundamental theoretical aspects of holography are discussed and the relevant influence of the water over physical behavior laser beam are theoretically considered in the analysis. The experimental analysis is done by recording holograms of a steel plate submerged into water. In order to create a fixed standard image hologram, the steel plate was submitted to a load generating interference bands, when the double exposure technique was used. In order to investigate the effect of the water over the resolution of the interferogram, it was used distilled water, sea water, drinking water and tap water, and also compared to the interferogram taken in the air, under the same loading condition. The values of the displacements obtained in air and underwater are compared. The images were processed by using the Global Lab. Software. The software, analyzing the interference bands, gives information about band resolution per 'mm', average resolution for the full amplitude, the distribution of the bands along the interferogram, the separation between bands, a graphical recording of the bands intensity, the width of bands and the fringe pattern recording.

Original languageEnglish
Number of pages5
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4) - Montreal, Can
Duration: 24 May 199829 May 1998


ConferenceProceedings of the 1998 8th International Offshore and Polar Engineering Conference. Part 3 (of 4)
CityMontreal, Can


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