High sensitivity and low magnetic field sensors can be used in aviation, aerospace and satellite communications technology. As you know, with the development of absorbing technology in the military industry, military objects can hide themselves by covering with a layer of absorbing materials, but they will produce a magnetic field any way, thus the GMR magnetic field sensor can find out the hidden objects. GMR magnetic field sensor can be used on the satellite for detecting objects on the surface of the earth and mineral deposits beneath. Electronic compass has great contribution for weapons, missile navigation (dead reckoning), marine and aviation navigation equipment. If you assemble magnetic sensor in the mine or mines, as tanks or warships are made of iron and steel, when they approach mines ( without touch the target ) , the sensor can detect changes in the magnetic field, so that mine or mines will explode , improved lethality. In the early 1980s U.S. Navy started to develop Terfenol-D underwater sonar, as permanent magnet generates magnetic bias field, solenoid generates an alternating magnetic field , the magnetic field will change with ring expansion and contraction and send the sound waves. To probe the water target by underwater acoustic propagation characteristics, to search, measure, identify and track submarines and other underwater targets, in order to conduct underwater acoustic warfare, underwater tactical communications , navigation and weapons guidance, protection of ships, aircraft and submarine tactical maneuver in water weapons.

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