DISPLACEMENT SENSOR AND METHOD FOR DETECTING DISPLACEMENT USING THEREOF

摘要

A displacement sensor and a method for detecting displacement using the same are disclosed. According to an embodiment of the present invention, the displacement sensor comprises: a coupler element which can perform a motion mutually associated with the position of a component; a transmitting coil which is excited by a excitation signal in order to generate electromagnetic radiation; at least one receiving coil which generates a receiving signal through inductive combination with the transmitting coil according to the shielding of the electromagnetic radiation by the coupler element; and two reference coils which generate individual reference signals irrelevant to the position of the coupler element through inductive combination with the transmitting coil. The two reference coils are placed by considering the shape of the coupler element or generate reference signals having a signal change amount different from each other according to changes in a gap from the coupler element. The two reference coils also generate a compensation signal, which includes information on the gap where common mode elements are removed, using a ratio of addition to subtraction for the two reference signals. In addition, a signal processing unit is further included to sense the displacement corresponding to the position of the component by considering the gap in order to compensate for the common mode elements and the gap error and improve accuracy in sensing the displacement. [Reference numerals] (130,BB) Area A; (140,AA) Area B