said apparatus being characterised in that said transmit circuit is configured to apply less energy to {HEAD ~ the creation} of said pulses when the distance between said transducer and said surface is less than a defined distance and the amplitudes of said echo signals exceed {TAIL ~ a pre defined amplitude} 
said apparatus being characterised in that said transmit circuit is configured to apply less energy to { HEAD ~ the creation } of said pulses when the distance between said transducer and said surface is less than a defined distance and 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 HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL