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Article

A Contactless Laser Doppler Strain Sensor for Fatigue Testing with Resonance-Testing Machine

1
Institute of Electrical Information Technology, Clausthal University of Technology, Leibnizstr. 28, D-38678 Clausthal-Zellerfeld, Germany
2
SincoTec Test & Engineering GmbH, Innovationspark Tannenhöhe, Freiberger Str. 13, D-38678 Clausthal-Zellerfeld, Germany
3
SincoTec Holding GmbH, Innovationspark Tannenhöhe, Freiberger Str. 13, D-38678 Clausthal-Zellerfeld, Germany
*
Author to whom correspondence should be addressed.
Sensors 2021, 21(1), 319; https://doi.org/10.3390/s21010319
Received: 4 December 2020 / Revised: 25 December 2020 / Accepted: 29 December 2020 / Published: 5 January 2021
(This article belongs to the Special Issue Laser Doppler Sensors)
In this article, a non-contact laser Doppler strain sensor designed for fatigue testing with the resonance-testing machine is presented. The compact sensor measures in-plane displacements simultaneously from two adjacent points using the principle of in-plane, laser-Doppler vibrometry. The strain is computed from the relative displacements divided by the distance between these two points. The optical design, the mathematical model for estimating noise-limited resolution, the simulation results of this model, and the first measurement results are presented. The comparison of the measurement results of our sensor with the results of a conventional strain gauge shows that our design meets the measurement requirements. The maximum strain deviation compared to conventional strain gauges of the laser-Doppler extensometer is below 4×105 in all performed experiments. View Full-Text
Keywords: dynamic strain measuring; remote sensing; in-plane laser Doppler vibrometry dynamic strain measuring; remote sensing; in-plane laser Doppler vibrometry
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MDPI and ACS Style

Wang, F.; Krause, S.; Hug, J.; Rembe, C. A Contactless Laser Doppler Strain Sensor for Fatigue Testing with Resonance-Testing Machine. Sensors 2021, 21, 319. https://doi.org/10.3390/s21010319

AMA Style

Wang F, Krause S, Hug J, Rembe C. A Contactless Laser Doppler Strain Sensor for Fatigue Testing with Resonance-Testing Machine. Sensors. 2021; 21(1):319. https://doi.org/10.3390/s21010319

Chicago/Turabian Style

Wang, Fangjian, Steffen Krause, Joachim Hug, and Christian Rembe. 2021. "A Contactless Laser Doppler Strain Sensor for Fatigue Testing with Resonance-Testing Machine" Sensors 21, no. 1: 319. https://doi.org/10.3390/s21010319

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