said method being characterized in that energy applied to the creation of said pulses is reduced by reducing the amplitudes of the transmitted pulses when the distance between said transducer and said surface is less than a defined distance and {HEAD ~ the amplitudes} of said echo signals exceed {TAIL ~ a pre defined amplitude} 
exceed
said method being characterized in that energy applied to the creation of said pulses is reduced by reducing the amplitudes of the transmitted pulses when the distance between said transducer and said surface is less than a defined distance and { HEAD ~ the amplitudes } of said echo signals exceed { TAIL ~ a pre defined amplitude }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL