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Sonic Echo/Impulse Response Integrity Testing

Testing Unknown Foundations

Sometimes it is important to be able to test a foundation after it has been constructed even if testing had not been planned.  Such cases often occur for the re-use of existing foundations or for evaluating a foundation for a transmission line tower or wind turbine.

FTC utilizes a form of non-destructive testing (low strain dynamic testing) called sonic echo/impulse response.  This test involves the use of an instrumented hammer and special receivers (an accelerometer and geophone) mounted to the shaft surface.  Usually, there is enough of the foundation exposed at the top (outside the bolt circle) to perform testing without the need to remove the overlying structure.  My analyzing the reflected compression waves (echoes) returned from the shaft as a result of the hammer impact, many important characteristics such as overall shaft integrity and length can be determined.

 

Sonic Echo/Impulse Response Integrity Testing