S012-0008
ROMY: Data Analysis
ROMY: Data Analysis
Tuesday, 8 December 2020
Poster
Abstract:
The four component gyroscope array ROMY (ROtational Motion in SeismologY) is able to resolve Earth's rotation rate and polar motion in almost real time and thus represents a unique sensor worldwide. Observations of rotational motions on four triangular rings, hence four components, enable recordings valuable not only for geodetic applications but also for a broad range of applications in seismology. The ubiquitous Earth's rotation rate hereby serves as a carrier signal onto which small scale transient as well as ambient rotation signals are modulated.
In order to generate a rotation rate time series of the Sagnac signal sophisticated data acquisition and processing is necessary. Different frequency demodulation techniques are investigated to ideally exploit the recordings for various frequency ranges depending on the application. First regional and teleseismic events detected with ROMY are analysed and compared to recordings of the single component G-ring laser system located at the Fundamentalstation Wettzell in Germany.
Moreover, different intensities for the counter-propagating single beams are observed, which however contradicts the theory of reciprocal ray paths as a requirement for the lasing process itself. This possibly results from backscattering at the corner mirrors. To better understand the performance of the ring laser itself not only the Sagnac interferogram, but also the two clockwise and anti-clockwise propagating single beams are studied.
ROMY represents a significant contribution for rotational seismology, however some further hardware refinement is necessary in order to exploit the sensor's full potential.
In order to generate a rotation rate time series of the Sagnac signal sophisticated data acquisition and processing is necessary. Different frequency demodulation techniques are investigated to ideally exploit the recordings for various frequency ranges depending on the application. First regional and teleseismic events detected with ROMY are analysed and compared to recordings of the single component G-ring laser system located at the Fundamentalstation Wettzell in Germany.
Moreover, different intensities for the counter-propagating single beams are observed, which however contradicts the theory of reciprocal ray paths as a requirement for the lasing process itself. This possibly results from backscattering at the corner mirrors. To better understand the performance of the ring laser itself not only the Sagnac interferogram, but also the two clockwise and anti-clockwise propagating single beams are studied.
ROMY represents a significant contribution for rotational seismology, however some further hardware refinement is necessary in order to exploit the sensor's full potential.