Today photogrammetry is a primary method for the remote non-destructive testing of structures. Its disadvantages are high cost of equipment, post-processing of the data, low accuracy and demand in highly skilled personnel. Laser scanning can control geometric parameters of the structure only; it also requires highly trained personnel, involves expensive equipment and cannot produce results in real time. GPS receivers monitoring is based on long-term observations and has 1-cm accuracy, but in relation with general geometry of the structure only. The developed technology includes on-line structural health remote monitoring in various ranges of radiation (visible, infrared) at close distances (<50 m). The data is collected into a single 3D model in real time. The device is mounted on a platform, either stable or moving along/around the structure in an automatic mode. The distinction between the suggested method and known technologies is that it is assumed to split the tasks of photogrammetry by means of optics and to measure the dimensions and their changes by laser, while the surface conditions of the structure are determined by optics and infra-red survey. The thermal survey is conducted at a short distance; the unit is placed along the structure surveyed and simultaneously processes data received through special algorithms to be developed for monitoring structural geometry and surface conditions. 3D structural model in both visible and infrared spectrum is created in real time. Such approach excludes application of costly components, improves accuracy and eliminates disadvantages of the known methods.
- Improved accuracy
- Reduced costs of equipment and personnel
Applications and Opportunities
- Photogrammetry, remote non-destructive testing of structures