Why does the displacement sensor have data bounce
There are many kinds of displacement sensors, such as linear displacement sensors, slider displacement sensors, magnetostrictive displacement sensors, laser displacement sensors, etc. Among them, the linear displacement sensor is the most widely used. When we use this sensor, there will often be data fluctuations, which are mainly caused by the following reasons.
First of all, when this happens, it is necessary to check whether the cable insulation is damaged, and it is in regular contact with the casing of the machine to cause a short circuit to the ground. Secondly, the alignment of the linear displacement sensor needs to be very good, but the parallelism can be allowed to have an error of ±0.5mm, and the angle can be allowed to have an error of ±12°. However, if the parallelism error and the angle error are both too large, then the display number will be bounced. When such a situation occurs, the parallelism and angle must be adjusted. Thirdly, the three wires of the linear displacement sensor cannot be connected wrongly, and the power wire and output wire cannot be exchanged. If the upper line is connected incorrectly, there will be a large linear error, it is difficult to control it, the accuracy of the control will become very poor, and the display is prone to beating and so on. In addition, FM interference and electrostatic interference may cause the digital display of the linear displacement sensor to jump. Therefore, the signal line of the electronic ruler should be separated from the strong current line of the equipment. The electronic ruler must be grounded forcibly. The signal wire needs to use a shielded wire, and a section of the electrical box should be grounded to the shielded wire. If there is high-frequency interference, the voltage measurement using a multimeter will usually display normal, but the displayed number will be pulsating; and when there is electrostatic interference, the situation is the same as that of high-frequency interference. To prove whether it is electrostatic interference, just use a power cord to short-circuit the cover screw of the electronic ruler with a certain metal on the machine. As long as the short-circuit is connected, the electrostatic interference will be eliminated immediately . But if you want to eliminate high-frequency interference, it is difficult to use the above method. You can try to pause the high-frequency interference source to see if the display result is better, so as to judge whether it is a high-frequency interference problem.
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