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Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph

Sławomir Niespodziany Anna T. Kurzych Michał Dudek
Opto-Electronics Review | 2021 | 29 | 2 | 71-79 | DOI: 10.24425/opelre.2021.135830
Keywords fiber optic sensor fibre optics rotational seismograph closed-loop detector diode avalanche photodiode noise spectral density
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Abstract

This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10−7 rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
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Bibliography

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Authors and Affiliations

Sławomir Niespodziany
1
ORCID: ORCID
Anna T. Kurzych
2
ORCID: ORCID
Michał Dudek
2
ORCID: ORCID
  1. Institute of Heat Engineering, Warsaw University of Technology, 21/25 Nowowiejska St., Warsaw 00-665, Poland
  2. Institute of Technical Physics, Military University of Technology, 2 gen. S. Kaliskiego St., Warsaw 00-908, Poland

Towards uniformity of rotational events recording – initial data from common test engaging more than 40 sensors including a wide number of fiber-optic rotational seismometers

Anna T. Kurzych Leszek R. Jaroszewicz Michał Dudek Bartosz Sakowicz Jerzy K. Kowalski
Opto-Electronics Review | 2021 | 29 | 1 | 39-44 | DOI: 10.24425/opelre.2021.135827
Keywords seismometer optical fiber interferometer recording rotational seismology
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Abstract

Rotational seismology is one of the fastest developing fields of science nowadays with strongly recognized significance. Capability of monitoring rotational ground motions represents a crucial aspect of improving civil safety and efficiency of seismological data gathering. The correct sensing network selection is very important for reliable data acquisition. This paper presents initial data obtained during the international research study which has involved more than 40 various rotational sensors collected in one place. The key novelty of this experiment was the possibility to compare data gathered by completely different rotational sensors during artificially generated ground vibrations. Authors collected data by four interferometric optical fiber sensors, Fiber-Optic System for Rotational Events & Phenomena Monitoring (FOSREM), which are mobile rotational seismographs with a wide measuring range from 10-7 rad/s up to even few rad/s, sensitive only to the rotational component of the ground movement. Presented experimental results show that FOSREMs are competitive in rotational events recording compared with the state-of-the-art rotational sensors but their operation still should be improved.
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  23. Konno, K. & Ohmachi, T. Ground motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor. Bull. Seismol. Soc. Am. 88, 228-241 (1998).
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Authors and Affiliations

Anna T. Kurzych
1
ORCID: ORCID
Leszek R. Jaroszewicz
1
ORCID: ORCID
Michał Dudek
1
ORCID: ORCID
Bartosz Sakowicz
2
ORCID: ORCID
Jerzy K. Kowalski
3
ORCID: ORCID
  1. Institute of Technical Physics, Military University of Technology., 2 gen. S. Kaliskiego St., Warsaw 00-908, Poland
  2. Dep. of Microelectronics and Computer Science, Lodz University of Technology, 221/223 Wólczańska St., Lodz 90-924, Poland
  3. Elproma Elektronika Ltd., 13 Szymanowskiego St., Łomianki 05-092, Poland

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