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Tales in Embedded Sensing

Tales in Embedded Sensing. Derek Skolnik, Martin Lukac V. Naik, W. Kaiser, P. Davis, J. Wallace, D. Estrin. STORIES. 50 - 70 40 - 50 20 - 40. Tall Building Boom Performance-based “alternative” designs require peer review per UBC 97 Update LA-DBS instrumentation requirements. Saw cuts.

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Tales in Embedded Sensing

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  1. Tales in Embedded Sensing Derek Skolnik, Martin Lukac V. Naik, W. Kaiser, P. Davis, J. Wallace, D. Estrin

  2. STORIES 50 - 70 40 - 50 20 - 40 • Tall Building Boom • Performance-based “alternative” designs require peer review per UBC 97 • Update LA-DBS instrumentationrequirements

  3. Saw cuts I-35W Bridge Collapse N • Structural Health Monitoring • Rapid post-event assessment • minimize downtime • Damage Detection • need more than acceleration

  4. SHMnet System • Model-driven deployments Sensors • Suite • Interstory displacement ENSBox • Time synchronization • Robust WLAN Algorithms • Damage detection • Post-event assessment

  5. Sensor Development • Two approaches used to measure interstory displacements • double integration of acceleration • LVDT with spring tensioned wire • New non-contact sensor LVDT Laser Plano-convex lens Accelerometer Photodiode

  6. SHMnet Systems

  7. SHMnet GeoNet standing up • System shared with GeoNet • Difference: deployment scenarios and sensors • Rapidly deployed after earthquakes • 0.5 – 1.0 Km grid • Active >= month

  8. Frequency of aftershocks determined by size of initial shock (Omori’s Law) Small EQ -> aftershocks for a few weeks Large EQ -> aftershocks for a few years Opportunity to study earthquake propagation near epicenter GeoNet: Aftershock Chaser . . .

  9. MASE & Peru vs GeoNet • Short term – smaller batteries • Integrated low power ADC • Passive seismometer • LEAP2 platform • Sleep scheduling • Long term • Big batteries • Solar panels • Power hungry ADC • Active seismometer 30+ days 5 days

  10. Sleep Scheduling: Impact on the Entire System Data Transport / Routing • Preserve routes between sleep cycles • Aggressive route repair after wake up Time Synchronization • Maintain sync across sleep cycles • Most important when no GPS available System Management • Disruption Tolerant Shell (DTS) • Used in MASE network, applicable here Deployment • Determine network capacity as deploying • Bound on sleep scheduling

  11. Thank You Please visit our poster

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