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Abstract

In this paper, we present metrology and control methods and techniques for electromagnetically actuated microcantilevers. The electromagnetically actuated cantilevers belong to the micro electro mechanical systems (MEMS), which can be used in high resolution force and mass change investigations. In the described experiments, silicon cantilevers with an integrated Lorentz current loop were investigated. The electromagnetically actuated cantilevers were characterized using a modified optical beam deflection (OBD) system, whose architecture was optimized in order to increase its resolution. The sensitivity of the OBD system was calibrated using a reference cantilever, whose spring constant was determined through thermomechanical noise analysis registered interferometrically. The optimized and calibrated OBD system was used to observe the resonance and bidirectional static deflection of the electromagnetically deflected cantilevers. After theoretical analysis and further experiments, it was possible to obtain setup sensitivity equal to 5.28 mV/nm.
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Authors and Affiliations

Daniel Kopiec
1
Wojciech Majstrzyk
2
Bartosz Pruchnik
1
Ewelina Gacka
1
Dominik Badura
1
Andrzej Sierakowski
2
Paweł Janus
2
Teodor Gotszalk
1

  1. Wrocław University of Technology, Faculty of Microsystems Electronics and Photonics, Department of Nanometrology, Janiszewskiego 11/17, Wrocław 50-372, Poland
  2. Łukasiewicz Research Network, Institute of Microelectronics and Fotonics, Lotników 32/46, Warsaw 02-668, Poland
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Abstract

The protection and use of historic buildings is a difficult and costly task. Most often, these objects are under conservatory protection and any interference in their structure requires appropriate consent. On the other hand, conducting construction works on historic buildings carries a high risk of their damage or even destruction. Therefore, proper prior diagnostics is an extremely important factor affecting the scope and manner of works to be conducted. The paper presents the use of 3D scanning to determine the deflection of the ceiling under the Column Hall of the historic Palace, the floor of which showed elasticity, recorded during changing service loads. After identifying the places with the greatest deflections, based on data from 3D laser scanning, test holes were made and wood samples from the ceiling were taken to perform moisture content and mycological tests. An endoscopic inspection camera was inserted into test holes, providing the basis for recognizing the structure of the ceiling, i.e. arrangement of layers as well as dimensions and spacing of ceiling beams. Strength calculations were made with the limit state method resulted in the determination of the maximum permissible service load on the ceiling. The presented course of action in diagnostics of the analysed historic building may be an example of a preliminary procedure to be taken before deciding on changes in the manner of use of historic buildings or the functionalities of their individual parts.
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Authors and Affiliations

Anna Szymczak-Graczyk
1
Zbigniew Walczak
1
Barbara Ksit
2
ORCID: ORCID
Zdzisław Szyguła
3

  1. Department of Construction and Geoengineering, Poznan University of Life Sciences, 60-637 Poznań, Poland
  2. Institute of Building Engineering, Poznan University of Technology, Piotrowo 5, 60-965 Poznań, Poland
  3. Company owner, Poland

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