Acta Geodynamica et Geomaterialia

Title: THE APPLICATION OF OPTOELECTRONIC SET FOR MEASURING RELATIVE MOVEMENTS OF ROCK BLOCKS
Authors: Cmielewski Kazimierz, Goluch Piotr, Kuchmister Janusz and Wilcznska Izabela
DOI: 10.13168/AGG.2015.0008
Journal: Acta Geodynamica et Geomaterialia, Vol. 12, No. 1 (177), Prague 2015
Full Text: PDF file (1.7 MB)
Keywords: rock mass deformation measurements, close-range mono-photogrammetry, opto-electronic technique
Abstract: The article presents a new method for measuring relative displacements of rock blocks using the opto-electronic technique. Due to the fact that very precise opto-electronic devices are available on the market, it is possible to design various sets of measuring instruments. The proposed measuring kit consists of a set of lasers arranged in configurations identified by the project and CCD/CMOS camera, which is a measuring receiver. The measuring set designed and developed by the authors of the paper can be successfully used to monitor the relative displacements at short distances e.g. of rock blocks and monadnocks, in the cave corridors, in adits and water dam galleries. This method is based on angular intersection accomplished with laser beams, which are recorded by the CCD/CMOS camera. The tests were performed in 3 cycles for the following distances between the transmitter and the receiver: 38.5 cm, 78.0 cm and 153 cm. The obtained results of the measurements were subjected to statistical analysis based on the test: Student's t and F Fisher-Snedecor. Initial research and experimental works with a prototypical measuring set carried out by the authors in the laboratory enabled to determine the simulated displacements with the measurement accuracy better than ± 0.06 mm (about 1 pixel).