Patent ID: 8272269
Filing Date: 2012-09-25
Classification: A61B,G01N

Abstract:
1. A method for examining a medium, comprising the following steps of: transmitting a measurement input signal comprising at least one measurement frequency, wherein the measurement input signal is coupled into a medium; receiving a measurement output signal emerging from the medium; transmitting a counter measurement input signal comprising at least one counter measurement frequency, wherein the counter measurement frequency essentially corresponds to the measurement frequency, and wherein the counter measurement input signal is coupled into the medium simultaneously and in an opposite direction to the measurement input signal; receiving a counter measurement output signal emerging from the medium; calculating a Doppler correction by comparing the counter measurement input signal with the counter measurement output signal in terms of the counter measurement frequency, and by comparing the measurement input signal with the measurement output signal in terms of the measurement frequency; calculating a phase shift between the at least one measurement frequency of the measurement input signal and the corresponding measurement frequency of the measurement output signal; and correcting the phase shift as a function of the Doppler correction.