Online detection pole piece areal density and automatic alarm device

The invention provides an online detection pole piece areal density and automatic alarm device. The device comprises a thickness meter, an alarm and a control module; the thickness meter is used for measuring the thickness of a pole piece penetrating through the internal of the thickness meter, an energy source of the thickness meter makes straight reciprocating motion in the thickness meter, anda motion direction of the energy source is vertical to the motion direction of the pole piece; the control module is connected with the thickness meter and the alarm; the control module is used for computing the areal density of the pole piece according to a measurement value of the thickness meter and comparing the acquired areal density with each of an areal density upper limit and an areal density lower limit, and controlling the alarm to give out an alarm according to a comparison result. By monitoring real-time thickness measurement of the thickness meter, the comprehensive monitoring onthe areal density of the p