| Geotechnical Monitoring |  | Pile Testing | | Low Strain Dynamic Pile Testing |
The Pile Integrity Tester, also know as Sonic Echo or Pulse Echo methods, is used for low strain integrity testing. The Pile Integrity Tester may be used for auger cast-in-place piles, bored shafts, driven concrete piles and concrete filled pipes. It detects potential defects such as major cracks, necking, soil inclusions or voids and, in some situations, the method can determine unknown lengths of piles. The Pile Integrity Tester does not require advance planning or access tubes, which makes it the most affordable option when the pile integrity is in question.
An accelerometer attached to the top or side of the installed pile monitors the impact and resulting deflections from a small hand-held hammer. The accelerometer signal 
is evaluated in the field or transferred to a personal computer for further analysis by PIT-W, a Windows based software program. If a defect is present along the shaft, its size and location can be estimated by analyzing the propagation and reflection of the wave induced on the foundations by the hammer impact. It is also possible to estimate the depth of the pile toe.
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