SEISmometer on Exomars
The SEIS instrument is designed to study the seismic activity by interior processes of planets and other bodies in the solar system and in addition it will detect the frequency of meteoritic impacts on the surface. Seismic events will be ranked according their magnitude and the source location will be determined by approximate distance and azimuth.
Foreseen scientific objectives are:
- Determining the present seismic activity of the planets
- Mantle attenuation and diffraction
- Determining the meteorite flux at the surface
- Determining the presence of liquid water in the deep subsurface
- Deep interior determination
- Core structure
- Mantle structure
The seismometer (SEIS) instrument was developed in the framework of ESA’s ExoMars mission. It uses two oblique very broad band sensors (VBB) and two broad band short period micro-sensors (SP). All together this system assembles a hybrid three axis seismic sensor in their overlapping band. Both sensor types rely on a proof mass which gets excited by external influence. The instrument is designed for an almost continuous operation during the foreseen period of the mission.
The measurements require leveling of the sensors and a good mechanical coupling to the ground. This will be achieved by the deployment system developed and constructed at MPS. Different deployment options are included regarding terrain uncertainties. Baseline is a first measurement period with SEIS fixed in the Lander and a second measurement period after deployment to the ground.
SEIS is a common development of five European partners, namely the teams from the Institute de Physique du Globe de Paris (IPGP), Imperial College London, ETH Zürich, Netherlands Institute for Space Research (SRON) and MPS.
Deployment system for the SEISmometer
- Mechanical support structure for the sensors
- Leveling system including drives
- Launch locks
- Electronics and operation software