Elastic-wave super-magnetic source system for cross-hole tomography

用于井间层析成像的弹性波超磁震源系统

Abstract

本发明公开了一种井间层析成像的弹性波超磁震源系统,该系统包括:发射机;超磁体,该超磁体上缠绕有线圈,所述线圈与发射机连接;以及簧片,其一端固定,另一端与所述超磁体连接,超磁体发生形变时挤压簧片产生弹性形变。该系统工作过程为:发射机通过调整线圈内部电流,改变加载在超磁体围的磁场;在磁场作用下,超磁体发生相应的形变;受到超磁体形变的挤压,簧片发生垂直于中轴面的弹性形变,并将弹性波辐射出去;在发射机的控制下,以伪随机序列重复上述步骤,直至伪随机序列发送完成。通过本发明系统能够将伪随机序列通过弹性波辐射出去,由于伪随机码扩频技术能够提升系统抗干扰性,提高采集信号的信噪比,在一定程度上提升探测距离。
Disclosed in the invention is an elastic-wave super-magnetic source system for cross-hole tomography. The system is composed of a transmitter, a super-magnetic body, and a reed. A coil winds around the super-magnetic body and is connected with the transmitter. One end of the reed is fixed and the other end of the reed is connected with the super-magnetic body; and when the super-magnetic body deforms, the reed is extruded to cause elastic deformation. The system works as follows: the transmitter adjusts the internal current of the coil to change the magnetic field loaded on the super-magnetic body; under the effect of the magnetic field, the super-magnetic body deforms correspondingly; under extrusion of the super-magnetic body deformation, the reed deforms elastically by being perpendicular to the axis surface and an elastic wave is irradiated; and under control by the transmitter, the above-mentioned steps are repeated in a pseudorandom sequence until the pseudorandom sequence sending is completed. Therefore, the pseudorandom sequence is sent out based on elastic wave irradiation; and because of the pseudo-random code spread spectrum technology, the anti-interference capability of the system is enhanced and the signal to noise ratio of the collected signal is improved, so that the detection distance increases to a certain extent.

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