Indoor Field Simulation And Control Technology Geomagnetic Shielding

Since the magnetic field is widely used in geomagnetic navigation, behavioral studies, health care, CRT and so on, magnetic analog control technology is becoming a hot research. Magnetic simulation system according to the technology has great practical value and practical significance in the production and scientific research. Magnetic analog system can be used to compensate geomagnetic and establish a zero magnetic space. We can do various experiments experiment in a specific or zero magnetic field.And also be used in magnetic measurement techniques,such as checking and calibration of various measuring magnetic instruments. These require precise control of the magnetic field simulation.Therefore, it’s an urgent need to establish a magnetic simulation system based on magnetic field shielded room.The system can be used to generate magnetic field that has high uniformity and good stability.and the intensity and direction of the field is controllable adjustable.The coil system is a key component in the magnetic simulation system.First, derivated the expression of the Helmholtz coil magnetic field distribution, and analyzesed the uniformity of its magnetic field. And in order to facilitate the analysis,designed the calculation software of analog magnetic in geomagnetic shielded room,and extended its application.The software can analyze and calculate the magnetic field distribution of coils that are various layouts and types.Then, designed a magnetic field simulation system on the basis of theoretical analysis of magnetic field distributionof three-dimensional coil system,and conduct error analysis and correction of the system.Finally, the experimental results show that the range of static magnetic field simulation is between-1Gs and1Gs and the error can be controlled within the80nT, while the remanence of zero magnetic space can be achieved within30nT.Precision of dynamic magnetic field is also essential to meet the requirements.The research provided a theoretical basis and some reference for the coil system of geomagnetic shielding room and the design of magnetic field simulation system.Meanwhile, the magnetic field simulation system also has practical engineering value.