Abstract
The tunnel magnetoresistance sensor (TMR) is the fourth generation of the industrial magnetic sensor, which has the characteristics of low power consumption, high sensitivity, and low- temperature dependence. The portable magnetic detector based on the TMR sensor can effectively pick up the magnetic signal by gradient probes based on TMR sensors. After the magnetic signal is amplified, filtered, and normalized, the magnetic source orientation and amplitude are displayed on the LCD screen. The experiment proves that the portable magnetic detector can effectively detect a magnetic field larger than 100 NT at a distance of 30 cm, and the design meets the experimental requirement. It is of great practical significance to detect the magnetic source in an unshielded indoor environment.
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