A Laser Based Distortion Measuring System,
Abstract
The collapse characteristics of structures under compressive loading are very dependent on deviations from perfect geometry. As computer based structural analysis has improved, increased account has been taken of the effect of initial imperfections and a need has developed for surveying structures to quantify the distortions which are present. The need for such data for ship structures has prompted the development of a method of measuring distortions which uses a laser beam to define a straight line from which measurements can be taken. The system described provides an efficient means of measuring and recording deviations form straightness or flatness of structures at 2 cm intervals in lengths of up to 2 metres, with an accuracy of about 0.5 mm under suitable lighting conditions. The magnetic tape cartridges produced by the data logger can be read into a mini computer to provide a graphic representation of the distortions present and to provide input data for structural analysis programs. The system may also be used for recording indentation damage such as in oil rig legs or submarine models and could be used over short arc lengths to provide data for determining deviations from round.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1982
- Accession Number
- ADA124577
Entities
People
- J. C. Brown