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Laboratory testing of the precision and accuracy of the TM-71 dilatometer
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SYSNO ASEP 0499833 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Laboratory testing of the precision and accuracy of the TM-71 dilatometer Author(s) Balek, Jan (USMH-B) ORCID
Urban, R. (CZ)
Štroner, M. (CZ)Source Title International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM 2018, Vol. 18, Issue 1.2. - Sofia : STEF92 Technology, 2018 - ISSN 1314-2704 - ISBN 978-619-7408-36-2 Pages s. 433-439 Number of pages 7 s. Publication form Print - P Action International Multidisciplinary Scientific Geoconference, SGEM 2018 /18./ Event date 02.06.2018 - 08.06.2018 VEvent location Albena Country BG - Bulgaria Event type WRD Language eng - English Country BG - Bulgaria Keywords TM-71 ; laboratory ; test ; dilatometer ; moire ; accuracy ; precision Subject RIV DE - Earth Magnetism, Geodesy, Geography OECD category Environmental and geological engineering, geotechnics R&D Projects LM2015079 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support USMH-B - RVO:67985891 EID SCOPUS 85058899236 DOI 10.5593/sgem2018/1.2/S02.055 Annotation The TM-71 dilatometer is a device manufactured in the 60s of the 20th century in the Institute of Rock Structure and Mechanics of the Czech Academy of Sciences. It has been developed as a reliable and easy-to-use rock crack monitoring facility capable of working even in the least favorable climatic conditions. It is a purely mechanical system capable of determining relative shifts and rotations in all three axis of two monitored blocks. The device is read out using two pairs of overlapping optical patterns, which are firmly connected to the rock blocks. Their mutual shifts and rotations changes the structure of image emerging on the overlap of the patterns based on moiré effect. The device is currently widely used to study geodynamic processes such as slow slope movements or movements on fracture structures. This article describes laboratory testing of the TM-71 device to determine the precision and accuracy, which is essential for reliable evaluation of the data measured. At present, the accuracy of reading the instrument is well known, which directly depends on the properties of the moiré patterns used and is readily quantifiable by the mathematical way. The purpose of the instrument testing was primarily to determine the accuracy from the mechanical point of view. Namely, accuracy of the response of the optical patterns to the induced displacement of the monitored blocks. For several series of laboratory tests, standard deviations of measured displacements were determined. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2019 Electronic address https://www.sgem.org/sgemlib/spip.php?article11786
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