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| Titel |
Portable sensor technology for rotational ground motions |
| VerfasserIn |
Felix Bernauer, Joachim Wassermann, Frederic Guattari, Heiner Igel |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132805
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| Publikation (Nr.) |
 EGU/EGU2016-13345.pdf |
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| Zusammenfassung |
| In this contribution we present performance characteristics of a single component
interferometric fiber-optic gyroscope (IFOG). The prototype sensor is provided by
iXBlue, France. It is tested in the framework of the European Research Council
Project, ROMY (Rotational motions – a new observable for seismology), on its
applicability as a portable and field-deployable sensor for rotational ground motions. To
fully explore the benefits of this new seismic observable especially in the fields of
vulcanology, ocean generated noise and geophysical exploration, such a sensor has to
fulfill certain requirements regarding portability, power consumption, time stamping
stability and dynamic range. With GPS-synchronized time stamping and miniseed
output format, data acquisition is customized for the use in seismology. Testing time
stamping accuracy yields a time shift of less than 0.0001 s and a correlation coefficient
of 0.99 in comparison to a commonly used data acquisition system, Reftek 120.
Sensor self-noise is below 5.0 ⋅ 10−8 rads−1Hz−1∕2 for a frequency band from
0.001 Hz to 5.0 Hz. Analysis of Allan deviation shows an angle random walk of
3.5 ⋅ 10−8 rads−1Hz−1∕2. Additionally, the operating range diagram is shown and ambient
noise analysis is performed. The sensitivity of sensor self-noise to variations in
surrounding temperature and magnetic field is tested in laboratory experiments.
With a power consumption of less than 10 W, the whole system (single component
sensor + data acquisition) is appropriate for field use with autonomous power supply. |
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