Abstract: Provided is an unbalanced sample data preprocessing method, which includes: a data acquisition request is received and initial data is acquired according to the data acquisition request, and the initial data is classified according to a preset classification rule to obtain first-class sample sets and second-class sample sets; characteristics of K first sample points extracted are analyzed to obtain a new data characteristic of the first-class sample sets; a new data label of the first-class sample sets is generated according to a first label corresponding to the first-class sample sets; a ratio between the number of first-class sample sets and the number of second-class sample sets is calculated; and new data of the first-class sample sets is generated according to the new data characteristic and the new data label, and the amount of new data is adjusted according to the ratio to increase the number of first-class sample sets.

Abstract: The invention relates to a transmitter of a through bit dipole acoustic logging device and the logging device, and the transmitter includes a substrate and 2 piezoelectric ceramic plates respectively at either sides of the substrate; wherein the piezoelectric ceramic plate is composed of at least one block of piezoelectric ceramic units; wherein the lengthwise direction of the piezoelectric ceramic elements is along the width direction of the piezoelectric ceramic plates, the width direction of the piezoelectric ceramic units is along the thickness direction of the piezoelectric ceramic plates, and the thickness direction of the piezoelectric ceramic units is along the lengthwise direction of the piezoelectric ceramic plates; the polarization directions of the piezoelectric ceramic units are along the thickness direction of the piezoelectric ceramic units; when electric excitation is applied along the length of the piezoelectric ceramic plate, the piezoelectric ceramic plate on one side of the substrate is ex