Short-Period Error Suppression Method of PCB-Based Inductive Linear Displacement Sensor
In the linear displacement measurement,the printed circuit board(PCB)-based new inductive displacement sensors is easy to lead to short-period errors in manufacturing,assembly,and other process links because of its large pitch.Among the types of short-period errors caused,the first-order and fourth-order errors are the most common short-period errors in PCB-based inductive linear displacement sensors.Therefore,in order to reduce the first-order and fourth-order errors,the generation mechanism of these two kinds of errors was first studied from the output signals,and then an error self-correction method that did not depend on external reference was proposed.Firstly,the sources of short-period first-order and fourth-order errors and the functions of the two errors with the original sine(SIN)and cosine(COS)signals of the sensor were analyzed theoretically.Then,a short-period error function model based on the characteristics of the original SIN and COS signals of the sensor was established,and the corresponding parameters of the first-order and fourth-order errors in the error function model were calculated based on the measured data of the sensor prototype.Finally,the first-order and fourth-order error models were used for the error compensation of the sensor prototype.The results of prototype experiments show that the peak-to-peak value of the error after compensation is reduced from 51.6 μm to 36.2 μm.The short-period first-order error is reduced by about 64.5%,and the short-period fourth-order error is reduced by about 83.0%.
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