Laboratory testing of the precision and accuracy of the ShapeAccelArray sensor in horizontal installation

0465020 - ÚSMH 2017 RIV BG eng C - Konferenční příspěvek (zahraniční konf.)
Balek, Jan - Urban, R. - Štroner, M.
Laboratory testing of the precision and accuracy of the ShapeAccelArray sensor in horizontal installation.
SGEM2016 Conference Proceedings. Vol. Book 1. Sofia: STEF92 Technology, 2016, s. 871-878. ISBN 978-619-7105-55-1. ISSN 1314-2704.
[International Multidisciplinary Scientific Geoconference - SGEM 2016 /16./. Albena (BG), 30.06.2016-06.07.2016]
Institucionální podpora: RVO:67985891
Klíčová slova: ShapeAccelArray sensor * test * precision * accuracy * horizontal installation
Obor OECD: Physical geography

Sensor SAA (ShapeAccelArray) is to certain extent unique device enabling not only the automation of classical inclinometer measurements, but other utilization such as convergence measurements or registering of vibrations. SAA sensor is in basic principle an array of rigid segments and flexible joints. Joints allow movement in any direction except twist and allow the sensor to capture spatial variations of its neighborhood. Rigid segments are equipped with triaxial MEMS (Micro Electro-Mechanical System) accelerometers. These sensors enable high-frequency measurement of segments tilt relative to the direction of gravity. Full range of measurement of MEMS accelerometers allows installation in any position - vertically, horizontally or in combination of both. For inclusion of this sensor to the context of other methods for measuring shifts and deformations should be noted that there are many other geodetic and geotechnical methods used for the deformation size and direction determination. There can be mentioned as an examples 3D (laser) scanning (in [12] or in [13]), classic geodetic methods (in [14]) or GNSS methods (in [15]). Current publications describe functions the SAA sensor, examples of its practical application and comparison with other geotechnical methods. Sensor accuracy in terms of engineering surveying point of view has been solved minimally so far. This paper describes laboratory test of SAA sensor in a horizontal installation. The aim was to determine the accuracy characteristics of the measurement of vertical deformations without affect of the protective PVC casing, where the sensor is installed in field by default. Vertical deformations of the array were performed using special heaver, which allows to realize displacements with high accuracy using rotation of screws. We hope, that this contribution will bring useful information for potential users of this equipment.
Trvalý link: http://hdl.handle.net/11104/0263727