TY - CONF A1 - Moldenhauer, Laura A1 - Helmerich, Rosemarie A1 - Köppe, E. A1 - Wittmann, J. ED - Cosmi, F. T1 - Experimental modeling approach for determining the moisture damping exponent of a Bluetooth Low Energy signal in moist building material N2 - The presented development of a damping model is a research component of an experimental feasibility study about moisture in building materials measured with Bluetooth® Low Energy (BLE) signals. This study may be part of a structural health monitoring aiming on early damage detection in the built infrastructure and is increasingly focusing on wireless sensor Network technology. It is investigated, how the Received Signal Strength Indicator (RSSI) of a BLE signal, transmitted from the BLE-module embedded in building materials with changing moisture content is damped. The BLE-module communicates with a mobile Smart Device as tablet or mobile phone via 2.45 GHz-ISMfrequency band where water dipoles start to oscillate. If the BLE-signal transfers through a moist material, the moisture Content influences the RSS-Indicator. The damping model demonstrates this damping effect on RSSI by the abstraction of the reality observed in a real system. T2 - 34th Danube Adria Symposium CY - Trieste, Italy DA - 19.09.2017 KW - Moisture damping coefficient, KW - Buliding materials KW - Bluetooth Low Energy KW - RSSI KW - Experimental approach PY - 2017 SN - 978-88-8303-863-1 U6 - https://doi.org/https://www.openstarts.units.it/handle/10077/14834 SP - 141 EP - 142 CY - Trieste, Italy AN - OPUS4-44528 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie T1 - Active thermography N2 - Active thermography is introduced as tool for diagnostics in civil engineering structures. Aside from basic information, examples for applications of active thermography in different types of structures was presented. Active thermography was applied in historic structures to reveal former components or even ancient openings. Other examples present active thermography as a tool for nondestructive detection of debonding in CFRP strengthened structures. The way is explained, how the system was optimized for different materials. T2 - NDT&E Advanced Training Workshop CY - Berlin, Germany DA - 05.07.2017 KW - Active thermography KW - Strengthening KW - Nondestructive testing KW - Civil structures PY - 2017 AN - OPUS4-42920 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -