Articles | Volume 13, issue 2
https://doi.org/10.5194/jsss-13-167-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/jsss-13-167-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Extraction of nanometer-scale displacements from noisy signals at frequencies down to 1 mHz obtained by differential laser Doppler vibrometry
Dhyan Kohlmann
CORRESPONDING AUTHOR
Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany
Marvin Schewe
Institute of Electrical Information Technology, Clausthal University of Technology, Clausthal-Zellerfeld, Germany
Hendrik Wulfmeier
Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany
Christian Rembe
Institute of Electrical Information Technology, Clausthal University of Technology, Clausthal-Zellerfeld, Germany
Holger Fritze
Institute of Energy Research and Physical Technologies, Clausthal University of Technology, Goslar, Germany
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Short summary
A very small, anharmonic but periodic signal is separated from a noise background that is orders of magnitude larger than the pure signal. The approach consists of a sequence of filters and transformations and is demonstrated on an interferometric measurement of the high-temperature chemical expansion of a thin film, containing heat haze, thermal length drift, and parasitic vibrations. The displacement is 38 % larger and the uncertainty 35 % lower than when evaluated with previous approaches.
A very small, anharmonic but periodic signal is separated from a noise background that is orders...
Special issue