How to deal with pressure sensor noise?

The pressure sensor has noise during use. What is the cause of the noise?Only by clarifying the cause of the noise can the noise problem be effectively solved! 

Changzhou Baixiang summarized the reasons for the noise as follows:

1. For the pressure sensor, the low-frequency noise is mainly caused by the discontinuity of the internal conductive particles. Especially for carbon film resistors, there are often many tiny particles inside the carbonaceous material, and the particles are not continuous. When the current flow expires, the conductivity of the resistor will change and the current will change, resulting in poor contact flashing arc.

2. The shot noise generated by semiconductor devices is mainly due to the change in the number of charges accumulated in this area due to the change in the voltage of the barrier region at both ends of the semiconductor PN junction, thereby exhibiting a capacitance effect. When the forward voltage decreases, it makes the electrons and holes far away from the depletion zone, which is commensurate with the discharge of the capacitor.

3.When a reverse voltage is applied, the depletion zone changes in the opposite direction.When the current flows through the barrier area, this change will cause small fluctuations in the current flowing through the barrier area, thereby generating current noise.Generally, the electromagnetic components on the pressure sensor circuit board. If interference occurs, many circuit boards have electromagnetic components such as relays and coils. The inductance of the coil and the distributed capacitance of the shell will radiate energy to the vicinity after the smooth flow of electricity is expired. Will cause interference to nearby circuits.

4、Relays and other components work repeatedly, and instant reverse high voltage will be generated when the power is turned on and off, forming an instantaneous surge current. This instant high voltage will have a big impact on the circuit, which will severely interfere with the normal operation of the circuit.For more information on how to deal with pressure sensor noise, please Changzhou Baixiang