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  <doc>
    <id>44528</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>141</pageFirst>
    <pageLast>142</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace>Trieste, Italy</publisherPlace>
    <creatingCorporation>University of Trieste</creatingCorporation>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental modeling approach for determining the moisture damping exponent of a Bluetooth Low Energy signal in moist building material</title>
    <abstract language="eng">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.</abstract>
    <parentTitle language="eng">34th Danube Adria Symposium</parentTitle>
    <identifier type="isbn">978-88-8303-863-1</identifier>
    <identifier type="doi">https://www.openstarts.units.it/handle/10077/14834</identifier>
    <enrichment key="eventName">34th Danube Adria Symposium</enrichment>
    <enrichment key="eventPlace">Trieste, Italy</enrichment>
    <enrichment key="eventStart">19.09.2017</enrichment>
    <enrichment key="eventEnd">22.09.2017</enrichment>
    <author>Laura Moldenhauer</author>
    <author>Rosemarie Helmerich</author>
    <author>E. Köppe</author>
    <author>J. Wittmann</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Moisture damping coefficient,</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Buliding materials</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Bluetooth Low Energy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>RSSI</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Experimental approach</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>47171</id>
    <completedYear/>
    <publishedYear>2018</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>26469</pageFirst>
    <pageLast>26792</pageLast>
    <pageNumber/>
    <edition/>
    <issue>Issue 13, Part 2</issue>
    <volume>5</volume>
    <type>article</type>
    <publisherName>Elsevier Ltd.</publisherName>
    <publisherPlace>Radarweg 29, 1043 NX Amsterdam, The Netherlands</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Experimental modeling approach for determining the moisture damping exponent of a bluetooth low energy signal in moist building material</title>
    <abstract language="eng">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- and long-term monitoring aiming at 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 aim of the modelling is the derivation of a damping equation for the formal model to determine the moisture damping exponent to finding a correlation.</abstract>
    <parentTitle language="eng">MaterialsToday: Proceedings</parentTitle>
    <identifier type="doi">10.1016/j.matpr.2018.08.124</identifier>
    <identifier type="issn">2214-7853</identifier>
    <enrichment key="eventName">34th Danubia Adria Symposium on Advances in Experimental Mechanics</enrichment>
    <enrichment key="eventPlace">Trieste, Italy</enrichment>
    <enrichment key="eventStart">19.09.2017</enrichment>
    <enrichment key="eventEnd">22.09.2017</enrichment>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Laura Moldenhauer</author>
    <author>Rosemarie Helmerich</author>
    <author>E. Köppe</author>
    <author>H.-J. Wittmann</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>BLE Bluetooth low energy</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Sensor network</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>RSSI Received Signal Strength Indicator</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Structural Health Monitoring</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Moisture measurements</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
  </doc>
  <doc>
    <id>35511</id>
    <completedYear/>
    <publishedYear>2016</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>8</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Focusing air-coupled ultrasonic transducers based on ferroelectrets</title>
    <abstract language="eng">Rising importance of composite lightweight structures in aircraft and automobile industries increases the demand on reliable non-destructive testing methods for these structures. Air-coupled ultrasonic testing emerged to suit these requirements as it does not require any liquid coupling medium. In conventional air-coupled ultrasonic transducers, matching layers are used in order to decrease the impedance mismatch between transducer and air. Matching layers can be omitted by using ferroelectrets, which are charged cellular polymers having ferroelectric and piezoelectric properties. Especially a low Young’s modulus, low density and low sound velocity of cellular polypropylene (cPP) are properties being required for well-matched air-coupled ultrasonic transducers.&#13;
In our contribution we show recent enhancements of cPP transducers resulting in focused sound fields and thus improved lateral sensitivity. The influence of different transmitter apertures was evaluated using measurements of the emitted sound field. Further we show a transmission of a test specimen of carbon-fiber-reinforced plastic (CFRP) containing artificial damages. Results of focused transducers were compared to planar ferroelectret transducers, as well as to conventional air-coupled transducers.</abstract>
    <parentTitle language="eng">Proceedings 19th World Conference on Non-Destructive Testing</parentTitle>
    <identifier type="urn">urn:nbn:de:kobv:b43-355116</identifier>
    <identifier type="url">http://www.ndt.net/search/docs.php3?showForm=off&amp;id=19453</identifier>
    <enrichment key="eventName">19th World Conference on Non-Destructive Testing 2016</enrichment>
    <enrichment key="eventPlace">München, Germany</enrichment>
    <enrichment key="eventStart">13.06.2016</enrichment>
    <enrichment key="eventEnd">17.06.2016</enrichment>
    <licence>Creative Commons - Namensnennung 3.0</licence>
    <author>Florian Schadow</author>
    <author>Mate Gaal</author>
    <author>Jürgen Bartusch</author>
    <author>E. Dohse</author>
    <author>Enrico Köppe</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Air-coupled ultrasonic testing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ferroelectrets</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Cellular polypropylene</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Focused sound fields</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Focused transducers</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="literaturgattung" number="">Verlagsliteratur</collection>
    <collection role="fulltextaccess" number="">Datei für die Öffentlichkeit verfügbar ("Open Access")</collection>
    <collection role="unnumberedseries" number="">Wissenschaftliche Artikel der BAM</collection>
    <thesisPublisher>Bundesanstalt für Materialforschung und -prüfung (BAM)</thesisPublisher>
    <file>https://opus4.kobv.de/opus4-bam/files/35511/tu2g1.pdf</file>
  </doc>
</export-example>
