Pile Integrity and Length Testing

Subtronic owns and operates a Sonic Echo/Impulse Response (SE/IR) system, which determines the integrity and length of piles. SE/IR testing can be done on new and existing foundations, and it works best with columnar type foundations such as piles and drilled shafts. SE/IR testing can also be used on abutment walls, mat foundations, and other similar structures. Concrete, wood, and round steel pipe foundations are all able to be tested.

SE/IR Test


  • Hitting the top of the pile with a plastic hammer, fitted with a recording trigger
  • The impact of the hammer generates a sonic wave and starts data recording
  • The reflected waves are received and recorded by the equipment
  • The length, continuity, and structural integrity of the pile is determined after analysis of the collected data.


Subtronic owns a small, rugged, and easily deployed SE/IR system, which is accurate to within 5% in determining foundation depth.

Our system offers real-time data viewing while testing, and advanced digital filtering using lowpass, highpass, and basspass options allow enhanced identification abilities of echo events and reduced background noise. The ability to use SE and IR methods simultaneously also enables data correlations to be made between the two approaches, strengthening any data observations made.

Use for Concrete Inspection Equipment

  • Auger Cast Concrete Piles
  • Driven Concrete Piles
  • Drilled Shafts
  • Wall Piers
  • Wood Piles
  • Round Steel Pipe Piles
  • Bridge Abutments


  • Deep Foundation Depths
  • Cracks
  • Diameter Changes
  • Soil Intrusions
  • Voids
  • Uncured or Weak Concrete