Patent ID: 6976962

Claim:
A sensing system comprising (a) a signal generator that produces wide band transmit signals that have an equivalent representation in a frequency domain that is indicated by a frequency spectrum, and (b) a transducer device that converts said wide band transmit signals to wide band wave signals that propagate in a medium as indicated by propagating wavefronts, where said medium is a combination of different materials, where said propagating wavefronts propagate in said medium where said different materials cause different signal attenuation that variably attenuates said wide band wave signals that are distributed over said wavefronts, and (c) attenuation leveling material having attenuation that matches attenuation of a subject of examination, and a device to arrange said attenuation leveling material such that said propagating wavefronts propagate through materials having approximately the same attenuation for any single frequency, to cause uniformity in amplitude of said wide band wave signals that are distributed over propagated wavefronts, for said any single frequency, and (d) a receiving device that responds to said propagated wavefronts to produce wide band received signals, and (d) a signal modification device that modifies said wide band transmit signals to produce pre-compensated signals that compensate for propagation effects such that said wide band received signals are uniform in amplitude over a frequency spectrum.