Article No.
34629
Date
13.08.02
Hits
466
Writer
김아현
Title : Micro-Machined Capacitive Linear Encoder with a Mechanical Guide

Contact-type Linear Encoder-like Capacitive Displacement Sensor (CLECDiS) is a novel displacement sensor which has wide
measurable range with high resolution. The sensor, however, is very sensitive to relative rotational alignment between stator and mover of
the sensor as well as its displacement. In addition to, there can be some disturbances in the relative rotational alignment, so some noises
occur in the sensor's output signal by the disturbances. This negative effect of the high sensitivity may become larger as increasing
sensitivity. Therefore, this negative effect of the high sensitivity has to be compensated and reduced to achieve nanometer resolution of
the sensor. In this study, a new type capacitive linear encoder with a mechanical guide is presented to reduce the relative rotational
alignment problem. The presented method is not only to reduce the alignment problem, but also to assemble the sensor to the stage
conveniently. The method is based on a new type CLECDiS that has mechanical guide autonomously. In the presented sensor, when the
device is fabricated by micro-machining, the guide-rail is also fabricated on the surface of the sensor. By the direct fabrication of the
guide-rail with high precision micro-machining, errors of the guide-rail can be reduced significantly. In addition, a manual yaw alignment
is not required to obtain large magnitude of the output signal after the assembly of the sensor and the stage. The sensor movement is going
to follow the guide-rail automatically. The prototype sensor was fabricated using the presented method, and we verify the feasibility
experimentally.

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