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Open AccessLetter

Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network

1
Institute of Technical Physics, Military University of Technology, 2 gen. S. Kaliskiego St., 00-908 Warsaw, Poland
2
Elproma Elektronika Ltd., 13 Szymanowskiego Str., 05-092 Łomianki, Poland
3
Department of Earth and Environmental Sciences, Ludwig Maximilian University of Munich, Theresienstr. 41, D-80333 Munich, Germany
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(21), 6107; https://doi.org/10.3390/s20216107
Received: 16 September 2020 / Revised: 23 October 2020 / Accepted: 25 October 2020 / Published: 27 October 2020
(This article belongs to the Special Issue Rotation Rate Sensors and Their Applications)
Measurements of artificial events can substantially confirm the data validity of constructed rotational sensors, as well as provide methods for simplifying the measurement process. The above task, especially with international cooperation, can provide full-field measurement results of the target object, which can deliver more significant data and sensor properties. The paper presents vertical rotational velocity recordings gathered during an international experiment that took place at the Geophysical Observatory of the Ludwig Maximilian University of Munich in Fürstenfeldbruck, Germany. Data were obtained during artificial explosions, as well as external excitations induced by a VibroSeis truck. The authors present data recorded by two prototypes of optical fiber rotational sensors. They have been specially designed for rotational seismology needs and are characterized by a theoretical sensitivity equal to 2 × 10−8 rad/s/√Hz and a wide measuring range both in amplitude even up to 10 rad/s, and a frequency from DC to 1000 Hz. Their self-noise investigation during the aforementioned experiment showed that both sensors have precision no worse than 2 × 10−6 rad/s/sqrt (Hz) in all desired frequency range from 0.01 to 100 Hz. A down-sampling and a spectral analysis of the recorded signals are also presented. The recorded data and their analysis confirmed the performance and reliability of the applied optical fiber rotational sensors. Moreover, the presented international experiment underlines a special necessity for specifying the sensors’ performance test methodologies in the rotational seismology. View Full-Text
Keywords: rotational seismology; optical fiber sensor; detection; Sagnac interferometer rotational seismology; optical fiber sensor; detection; Sagnac interferometer
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MDPI and ACS Style

Kurzych, A.T.; Jaroszewicz, L.R.; Dudek, M.; Kowalski, J.K.; Bernauer, F.; Wassermann, J.; Igel, H. Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network. Sensors 2020, 20, 6107. https://doi.org/10.3390/s20216107

AMA Style

Kurzych AT, Jaroszewicz LR, Dudek M, Kowalski JK, Bernauer F, Wassermann J, Igel H. Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network. Sensors. 2020; 20(21):6107. https://doi.org/10.3390/s20216107

Chicago/Turabian Style

Kurzych, Anna T.; Jaroszewicz, Leszek R.; Dudek, Michał; Kowalski, Jerzy K.; Bernauer, Felix; Wassermann, Joachim; Igel, Heiner. 2020. "Measurements of Rotational Events Generated by Artificial Explosions and External Excitations Using the Optical Fiber Sensors Network" Sensors 20, no. 21: 6107. https://doi.org/10.3390/s20216107

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