Anti-interference problem of electromagnetic flowmeter (5)

2 Transmission channels of electromagnetic interference

Electromagnetic interference can be divided into two categories according to the transmission path: conductive interference, which mainly refers to the interference signals generated by electronic equipment passing through conductive media or public power lines; radiation interference, refers to the interference signals generated by electronic equipment passing through space to another An electrical network or electronic device.

From the perspective of the disturbed sensor, disturbing coupling can be divided into conduction coupling and radiation coupling.

3 Ways to suppress electromagnetic interference

    Aiming at the three elements of electromagnetic interference, the following three methods are proposed to solve the problem of electromagnetic interference:

 (1) Control the electromagnetic disturbance caused by the disturbance source

①Shield

Shielding is to select a shielding body between two spatial regions to block, to control the induction and radiation of electric fields, magnetic fields and electromagnetic waves from one region to another.