Geophysical Observatory Fürstenfeldbruck
Ludwigshöhe 8, D-82256 Fürstenfeldbruck
FOSREM team is doing a part of the active seismic experiment. All groups installed above 40 sensors and sensors matrix. FOSREM installed four fibre optics sensors – two FOS3 and two FOS5.
See our devices installed in the field.
IWGoRS 5th International Working Group on Rotational Seismology Sun Moon Lake, Taiwan 2019/09/22 – 26
The 5th IWGoRS workshop will be held at the Teacher’s Hostel, Sun Moon Lake, Taiwan, from September 22-26, 2019. Institute of Earth Sciences, Academia Sinica (IES) will be the local host. The workshop will cover on all aspects of rotational seismology including (but not limited to):
- instrumentation (portable sensors, ring lasers, tilt correction, etc)
- observation of rotations (application domains, best practices)
- array seismology (gradients, strains, rotations)
- data processing, wavefield interpolation, phase separation
- earthquake physics
- volcano seismology
- ocean-bottom observations
- earthquake engineering
- seismic inverse problems
With the advance of portable rotation sensor, we expect more rotation observations will be shown in the workshop.
The FOS-5 sensor contains a complete fibre-optic Sagnac interferometer with 250 mm diameter fiber-optics loop, analog to digital conversion circuits, FPGA based digital processing unit for close-loop operation, power conversion and management parts. All of these are placed in a robust case, meeting the IP67 requirements.
This internal digital processing unit provides rotation speed (Omega) value directly in digital form. The FOS-5 has an RS-485 interface for data and USB interface for diagnostic. The connection provides data transmission and power supply from PCU over only one, standard M12 cable within the distance of 500 meters.
On October, 17-18th 2014 Leszek Jaroszewicz, Anna Kurzych and Jerzy Kowalski participated in the Seventh European Workshop on the Seismic Behaviour of Irregular and Complex Structures (7EWICS) in Opole, Poland.
Since 1996, the European Workshop on the seismic behaviour of Irregular and Complex Structures (EWICS) has been taking place every three years under the auspices of Working Group (WG) 8 (Seismic Behaviour of Irregular and Complex Structures) of EAEE. The last Workshop, held in 2011 in Haifa, has about 40 papers included in the proceedings published by Springer. Its success confirms the interest of the scientific community in the covered topics.
Professor Leszek Jaroszewicz presented a paper “Fibre-Optic System for Rotational Events & Phenomena Monitoring: construction, investigation and area of application”. We also presented a poster and Fiber Optics Rotational Sensor in action. It was the debut FOSREM system in action.
The FOSREM team of scientists (Jaroszewicz L, Krajewski Z, Kowalski J.) participated in the 3rd International Workshop on Rotational Seismology (3IWGoRS) in Christchurch, New Zealand. This workshop was organized by the University of Canterbury in Christchurch.
Professor Leszek Jaroszewicz showed a presentation on “Fiber Optics System for Rotational Events&Phenomena Monitoring”. Zbigniew Krajewski and Jerzy Kowalski showed an infographic of the technical implementations of FOSREM rotational sensors.
The start of FOSREM project began in Agust 2011. The Military University od Technology and m-Soft Sp. z o. o. signed an consortium agreement. The goal of the consortium is to develop a supersensitive rotational motion sensors.
We outline the development and the application in a field test of the Autonomous Fibre-Optic Rotational Seismograph (AFORS), which utilizes the Sagnac effect for a direct measurement of the seismic-origin rotations of the ground. The main advantage of AFORS is its complete insensitivity to linear motions, as well as a direct measurement of rotational components emitted during seismic events.