门磁是安全报警的一种装置，由无线发射器和永磁体两部分组成，用来探测门、窗、抽屉等是否被非法打开或移动，分为无线门磁、无线卷闸门磁、有线门磁三种。
该系统由煤气传感器，人体红外传感器，声控传感器，门磁开关等部分组成。
This system consists of gas sensors, infrared sensor, televox body sensor, door magnetic switch components.
如果接上了门磁信号线，用户可以一目了然看到哪些门是开着的，哪些门是关着的。
If door magnet signal line is connected, the user can see which door is open and which door is closed at a glance.
本文分析了磁通门磁变仪探头三分量正交度误差对定向的影响并提出了减小其影响的措施。
Effects on the right-angled error of the three-component Flux Gate Magnetometer exploring head to direction were analysed and some methods to reduce the effect were put foward in this paper.
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