Report

Distributed Acoustic Sensing for Detection of Defects in the Test Dam at Älvkarleby

Updated 2023-06-08 Published 2021-03-11

Optiska fibrer för att mäta läckage eller rörelse finns i nästan 100 dammar i Sverige idag. Det betyder att man kan få fram seismiska gånghastigheter och information när materialets egenskaper avviker från det normala.

Genom att mäta temperaturen kan läckage detekteras och genom töjningsmätning kan man upptäcka om materialet rör sig. Flertalet installationer kan också användas för akustisk mätning, så kallad Distributed Acoustic Sensing, DAS. Utvecklingen av DAS har gått snabbt framåt de senaste åren.

Här redovisas resultat från Vattenfalls testdamm i Älvkarleby som visar att seismiska gånghastigheter kan fastställas och extraheras och ge information om avvikande materialegenskaper. Om det här överensstämmer med inbyggda defekter kommer att bedömas när läget för de olika defekterna presenteras.

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About the report

Report number

2021:732

Author

Sam Johansson, Sophie Beaupretre, Anaïs Boue, Anna Stork