Foreword: That the magnetic field is measured is that people observes ， studies and makes use of magnetism phenomenon one kind of means about physics Development of its history is already pretty age-old ， magnetic field measurement technology is containing and embodying from the ancient times so far human being collective crystallization of Especially physics the modern times and the sophisticated technique advancing by leaps and Almost any technology field all can't be seprated from magnetic field It applies each branches floating as well as the train may charge a series of high and new technology such as hot nuclear fusion device in the earth physics ， aerospace ， military affairs probing， biomedicine ， accelerator project ， high low temperature superconductivity ， magnetism whorl already Measurement technology and the instrument bring forward refreshed higher call for to the magnetic field as a result ， force magnetic field measurement technology to must combine with other different discipline each other ， form and a few new inter- The method that the magnetic field measures has four kinds mainly: Owing to electromagnetic induction law method ， owing to the method that Mechanics measures ， owing to magnetic field electricity effect method ， owing to the magnetic resonance Every has four kinds method to give a shortcoming preferential treatment ， have a general comparison but analysing down， the Hall effect follow the method being a relatively mature tiny measurement magnetic field， and can gain comparatively ideal But have deteriorated or declined it is just because that this is one kind relatively mature method ， go into and improvement to this method in recent The experiment designs that megagame aims at encouraging a college student to bring the thought being innovative into play ， once quiet Hall effect law going a step further studies the technology breakthrough the agenda having be being mentioned once again ， being called one new
