Investigation of the Effect of Receiver Bandwidth on Nonlinearity Measurements in Biological Samples

Investigation of measurement of nonlinearity parameter of biological media has been done in many papers. Among the introduced methods for the measurement of B/A as the nonlinearity parameter in materials, there are two primary approaches, finite amplitude methods (FAM) and thermodynamic Methods (TM). These two fundamental procedures have been used in several references for determination of B/A. The nonlinearity parameter gives us useful information about the materials and their microstructure. Since finite amplitude methods use absolute amplitude of the second harmonic, the measurement depends on receiver transducer. The objective of this study was investigation of the transducer effect on measurement the nonlinearity parameter (B/A) in finite amplitude distortion method. We used several different transducers with different bandwidth. The results showed that the bandwidth of receiver transducer has significant effect on the accuracy of measurements. We introduced a solution to compensate transducer effect and improved the measurement repeatability and accuracy.