Sonic Reflection (Pulse–Echo) Measurements

NDT frequently uses sonic reflection (pulse-echo) measurements to determine the length of sheet, wood, pipe and concrete piles and the quality or integrity of drill shafts and caissons. Sonic reflection measurements determine the time required for a stress wave generated with a projectile impact or hammer impact to travel from the top to the bottom of the pile or shaft and be reflected back to the top. Using the travel time and a wave velocity, as measured on exposed sections of the pile, the length of the pile can be calculated.


  • Drill Shaft Quality Assurance
    Boston Central Artery (Big Dig)
    Boston, MA
  • Dock Facilities
    Providence, RI
    New York, NY
    Hew Haven, CT
  • Wood Pile Length Determination
    Auger Cast Pile QA
    St. Charles Station Casino
    St Louis, MO
  • Sheet Pile & Wood Pile Length Determination
    Bridge Scour
  • Towers Foundations
    James City, VA
    WillIamsburg, VA
    Toana, VA

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