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정우철,남태철 ( W . C . Jeong,T . C . Nam ) 한국센서학회 1998 센서학회지 Vol.7 No.4
The principle, design, and application of a gear-tooth sensor for the rough environmental conditions such as high temperatures of up to 150℃ are studied. The rotation of a tooth wheel is detected by a couple of Hall elements manufactured on the SIMOX wafer by a methode of differential detection using bipolar silicon technology. The product sensitivity of the Hall element is about 510 V/AT over a wide temperature range of -40℃ ∼ 150 ℃. The differential Hall sensor makes the maximum possible distance between sensor and tooth wheel wider than that when single Hall element is used over a wide temperature range, and the maximum detectable distance is 4.5mm at driving current of 4mA.