Lofar

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Lofar

• Meer dan een radio telescope?

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Inhoud

• Geschiedenis van het universum..
• . en meer

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Geschiedenis van het universum
Observable with LOFAR
Observed with X-ray satellite
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Cosmic Air Showers
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Coronal Mass Ejections
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Een Wide Area Sensor Network als Radio-Telescoop ?
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Netwerk Specificatie

• Centrale Kern /- 50 Remote Stations
• gt20 Tbit/s data stroom
• gt40 Tflop supercomputer
• Toepassingen in
• Radio-astronomie
• Groot aantal (gt25,000) goedkope, breedband
  antennas
• Precisie Landbouw
• Ad-hoc netwerk van o.a. micro-klimaat sensoren
• Geo-wetenschappen
• Sensoren voor Grondwater, trillingen,
  bodemdaling, geleidbaarheid

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Geo-Initiatives

• Daylight Imaging (TU-Delft)
• Infrasound (KNMI)
• (Reservoir) Characterization and Monitoring
• Geo-mechanical Modeling
• Groundwater models
• Near Surface Characterization
• ICT

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Passive Imaging (TU-Delft)
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Transmission response observed at the surface
from white noise sources in the subsurface
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Simulated reflection response with coda
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(Reservoir) Characterization and Monitoring

• Optimal acquisition
• Cost effective (minimal effort, highest quality)
• Focused on target only (eliminating other effects
  either through acquisition or processing)
• Zone of influence (minimal acquisition geometry,
  data reduction)
• Monitor frequency (sampling rate)
• Automated modelling
• Cost effective (minimal effort in data
  processing, highest quality)
• Estimation of pressure and saturation (changes)
• Estimation gas volume (in place)

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Optimal acquisition

• Identify target and choose reflection points on
  target
• Determine source and receiver positions
  belonging to one reflection point

Surrounding area defines traces to be selected
for accurate imaging and data (or acquisition)
reduction
Baseline survey
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The Exloo testsite
Site Visit
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http//www.lofar.nl
http//www.lofar.org