Development And Evaluation Of Space Electromagnetic Noise Acquisition Based On Magnetic Resonance Measurement

The ground magnetic resonance sounding is the only geophysical method to detect groundwater reserves in the world at present.Compared with other geophysical methods,it has the advantages of high detection efficiency and quantitative detection results,which is widely used in water resources exploration and evaluation,as well as tunnel / mine flooding and other areas of water hazard monitoring.However,due to the lack of a priori knowledge of the electromagnetic noise existing in the environment,the ground magnetic resonance detector system is used for field detection.The blindness of the detection work,resulting in data processing can not extract the effective magnetic resonance signal,thus wasting a lot of manpower and material resources.To solve this problem,this paper presents the development of a space electromagnetic noise acquisition system based on magnetic resonance measurement.Through the analysis of the noise data obtained from the system to show whether the detection area has the necessity of carrying out the measurement of magnetic resonance.The research has important practical Value.First of all,by consulting a large number of documents and analyzing the characteristics of environmental noise,design and implementation of MSP430 as the main control system of magnetic resonance space electromagnetic noise collection system.Considering the practicability and stability of field experiment detection,this paper presents a sensor design based on PCB board.In order to filter out the signal outside the 1kHz-3kHz,the circuit design and the circuit design of the matching circuit are designed.In order to determine the location of the probe,the GPS module is added in this paper.In order to facilitate real-time storage results,using Micro SD for storage.Then,we propose a method to classify the spatial electromagnetic noise level based on the characteristic parameter fitting error.Through the simulation of the noisy MRS signal with different water content,the three levels of noise level in different noise environments are achieved,which provides theoretical guidance for practical application.Finally,the indoor and outdoor test of noise acquisition device is carried out.The performance of the noise acquisition system is Verified by testing the noise in different environments.At the same time,the effectiveness of the proposed method is Verified by analysing and evaluating of the electromagnetic noise in the space environment and the comparing with the results of the actual detection.