Abstract
Acoustic reflection from a region of continuously varying specific acoustic impedance is characterized, in the linear circuit sense, by a unit reflection impulse-response function R (t). It is shown that in the absence of attenuation and for modest impedance excursions, the impulse-response function corresponding to reflection from a region which has continuously variable impedance along the incident axis is given by R (2t)≈(dz/dt)/4z, where z(t) is the impedance profile and t is acoustic travel time.
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