Causes of data bounce of displacement sensor
Displacement sensors are components that convert physical quantities such as displacement, size, and deformation into electrical signals, and are mainly used for automatic mechanical displacement measurement and position positioning. The measurement and control accuracy of the displacement sensor determines the control accuracy of the mechanical equipment. The digital jitter of the displacement sensor is mainly caused by the following reasons: mechanical shock, power supply voltage fluctuation, electrostatic interference or electromagnetic interference, sensor installation and wiring, sensor quality problems
Mechanical shock can affect the measuring accuracy and service life of the displacement sensor. The higher the shock frequency and the greater the amplitude, the greater the impact on the sensor. In the process of installation and use, users can reduce the shock frequency and amplitude of the equipment through shock absorption treatment. For more severe occasions, consider using non-contact displacement sensors such as LVDT displacement sensors and magnetostrictive displacement sensors to replace contact displacement sensors such as resistive linear displacement sensors and drawstring displacement sensors.
Displacement sensors are commonly used as industrial power supplies with relatively stable voltages. For potentiometer principle sensors such as resistive linear displacement sensors and pull-rope displacement sensors, if the power supply voltage fluctuates greatly, the measurement and control data of the displacement sensor will follow it. For departmental open-air projects, if it is unfavorable to install industrial power supplies, consider using solar batteries for power supply, or use low-power displacement sensors to reduce the use time and sampling frequency of the sensors, and increase the battery life cycle.
Automation application sites usually have complicated electrical, magnetic, water, and oil environments. Electrostatic interference and electromagnetic interference are relatively severe, and the impact on the quality of the measurement and control data of the displacement sensor is the most severe. The displacement sensor is installed and operated in a standardized manner, grounded, and the sensor signal line is separated from the equipment power line. It is separated from various high-power equipment and high-frequency interference sources, which can reduce the impact of the external environment on the sensor. For special occasions with severe field interference, the signal quality of the displacement sensor can be ensured by technical means such as software and hardware filtering or electromagnetic isolation
Displacement sensor installation needs to be standardized, most sensors have higher requirements for neutrality, parallelism, perpendicularity or concentricity. If the installation deviation is large, the measurement error of the sensor can be increased, and the measurement data may be bounced when severe. The wiring of the displacement sensor must be accurate. If the signal line is connected to the power supply by mistake, the sensor will have a large linear error, poor control accuracy, and severe fluctuations in the displayed data. Especially easy to damage the sensor.
Sensor quality is the basic element that affects the accuracy of measurement and control. The cost of displacement sensor is usually not high in the design of measurement and control system, but the impact is great. The quality of the sensor is good, the measurement and control of the automation equipment are not chaotic, and the system control accuracy is good; the quality of the sensor is not high, it is difficult to achieve precise control, the risk of shutdown and maintenance is greatly increased, and the service life is difficult to effectively guarantee.