Near infrared photogrammetric technique on structure beam monitoring

Pratt, Daniel (2011) Near infrared photogrammetric technique on structure beam monitoring. [USQ Project]

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Abstract

Current methods used to monitor the strain and stress within structures such as bridges and high-rise buildings are not suitable over a 24-hour or weekly period. Furthermore, these methods are not mobile or compact.

This study aims to determine whether using photogrammetric techniques with both colour and NIR (near-infrared) images are suitable for structural beam deformation monitoring during loading in a low-light environment.

The following are the objectives this study aims to achieve:
1. To determine whether 3D measurements captured from NIR images and
colour images are in similar context in different lighting conditions.
2. To evaluate the accuracy of the measurements obtained by Near Infrared
and Colour Images.
3. To evaluate the suitability of Near Infrared and Colour photogrammetry for various structural beam materials.

In order to achieve these requirements, research was conducted to determine the best way to use these techniques. There were two experiments conducted. One experiment was conducted in the laboratory on testing strain and stress of structural beams, whilst the other was conducted on a bridge to determine if the structure could be observed.

Photographs were obtained from these simulations and were examined using the photogrammetric program ‘Australis’. With this program, photogrammetric bundle adjustments were conducted for experiments which were taken with both colour and NIR imagery. These bundles produced coordinates that were examined to view the beams at various levels of strain as well as the bridge structure to determine if the
coordinates were in the same parameters.

To conclude, this study was successful in determining whether colour and NIR imagery were in similar context in monitoring structural beams and a bridge structure. Further
work is recommended in relation to considering additional factors, such as rain and foggy weather conditions.


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Supervisors: Chong, Albert Kno-Fook
Date Deposited: 07 Jan 2013 03:06
Last Modified: 07 Jan 2013 03:06
Uncontrolled Keywords: photogrammetric, structure beams
Fields of Research : 09 Engineering > 0999 Other Engineering > 099902 Engineering Instrumentation
09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing
URI: http://eprints.usq.edu.au/id/eprint/22627

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