We often use pressure sensors, there are pressure sensors in various environments, sometimes we will find that the pressure sensor in the use of time and time measurement is not accurate, or the signal output is unstable, which is generally disturbed by the disturbance source, the disturbance source of the pressure sensor mainly includes the following several.
There are not many sources of disturbance in pressure sensors, first of all, radio frequency disturbance, mainly the disturbance of the start-up and abort of operation of large-scale power equipment and the disturbance of higher harmonics, such as the disturbance of the thyristor rectifier system. The second is the electrostatic induction of the sensor, which is also called capacitive coupling because there is parasitic capacitance between two branch circuits or components, so that the charge on one branch is transmitted to the other branch through the parasitic capacitance.
The second is leakage current induction, because the internal component brackets, binding posts, printed circuit boards, capacitors internal media or shells of electronic circuits are poorly insulated, especially the humidity of the sensor's use environment is large, and the insulation resistance of the insulator decreases, resulting in the addition of leakage current will cause disturbance. This is especially true when leakage current flows into the input stage of the measurement circuit. There is also electromagnetic induction, when there is mutual inductance between two circuits, the change of current in one circuit will be coupled to the other circuit through the magnetic field, this phenomenon is called electromagnetic induction. For example, transformers and coils leakage magnetic flux, energized parallel wires, etc.
Finally, there may be some other disturbances, in addition to the above disturbances, the on-site safety production monitoring system is susceptible to the above disturbances, because the system working environment is poor, but also simply subject to mechanical disturbance, thermal disturbance and chemical disturbance.
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