PULSE-ECHO
Pulse-echo method is useful in determining the depth of piles , drilled shafts or caissons. The method can also be used to determine concrete quality if the depth of the pile is known. The method is performed by impacting the top surface of the pile near a sensor. The impact creates a compression wave which is reflected at the bottom of the pile and it is received by the sensor. By using the waveform analyzer, arrival time of the reflected is calculated to determine the depth of the pile.