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이래덕,김한준,박세일,세묘노프 ( Rae Duk Lee,Han Jun Kim,Se Il Park,Yu P . Semyonov ) 한국센서학회 1998 센서학회지 Vol.7 No.2
Non-contacting capacitive sensors, based on principle of the cross capacitor, for measuring small displacement less than 1.95±0.5 mm have been fabricated and characterized. To overcome disadvantages of the existed capacitive sensors with 2-electrodes and 3-electrodes, the new sensor is consisted of 4-electrodes which are formed two electrode(high, low) and 2 guard electrodes on a sapphire plate with diameter 17 mm and thickness 0.7 mm, and are symmetrically situated with a constant gap of 0.2 mm between the electrodes. This sensor can be used for measuring both metallic and non-metallic target without ground connection, and is evaluated to the correlation coefficient of 0.9987 for the range of 1.95±0.25 mm and that of 0.9995 for 1.95±0.25 mm range.