Three-dimensional scanning magnetic resonance imager array antenna driving method and device

Abstract

The invention provides a method and device for driving an array antenna of a three-dimensional scanning nuclear magnetic resonance imager. By receiving the control command sent by the control system; analyzing the control command, generating a pulse transmission timing signal and an antenna switching control signal; according to the pulse transmission timing signal, the external input The high-voltage signal is processed, and the high-voltage radio frequency pulse of multiple channels is output; the high-voltage radio frequency pulse of at least one channel and the antenna to be worked in the nuclear magnetic resonance pulse array antenna are selected according to the antenna switching control signal, and each selected high-voltage radio frequency pulse is performed. superimposed to drive the antennas to be working to emit nuclear magnetic pulse signals. The device of the present invention can detect stratum information of a single azimuth by separately stimulating one antenna, and stimulate multiple antennas to detect stratum information of multiple azimuths, so as to realize the multi-layer slice information detection of different azimuth partition signals in the circumferential direction, and improve the nuclear magnetic resonance logging tool. The circumferential resolution capability of the probe realizes formation detection on a three-dimensional scale.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance logging, in particular to a method and device for driving an array antenna of a three-dimensional scanning nuclear magnetic resonance imager. Background technique [0002] The phenomenon of nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) was discovered in 1946, and it was soon applied in the fields of physics, chemistry, material science, life science and medicine. In the 1950s, NMR began to be applied in the oil and gas industry, initially in the field of reservoir rock physics. The nuclear magnetic resonance logging tool can use the principle of nuclear magnetic resonance to detect the formation information around the borehole, and has unique qualitative identification and quantitative evaluation capabilities of reservoir fluid. [0003] The probe is one of the important parts of the NMR logging tool. The structure of the probe determines the key performances suc...

AI Technical Summary

Problems solved by technology

Therefore, the nuclear magnetic resonance logging tool in the prior art can only perform signal detection in the radial depth dimension and axial depth dimension, and does not have the signal detection capability of the circumferential multi-directional sensitive area. Driving device for three-dimensional scanning of resonance logging tool

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