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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN4038 데이터시트(PDF) 18 Page - STMicroelectronics |
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AN4038 데이터시트(HTML) 18 Page - STMicroelectronics |
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18 / 39 page  Proximity sensor design AN4038 18/39 Doc ID 022686 Rev 1 4 Proximity sensor design Each application has specific proximity detection requirements. The design of the sensing electrode is the result of the sensing requirements of the application and of a careful analysis of what the sensor environment is over the lifetime of the application. The sensor is built with two electrode plates. The two electrode plates create a projected capacitance. The projected capacitance is defined in Equation 2 and illustrated in Figure 15. Equation 2: where C = capacitance in farad (F) εd = permittivity of the dielectric A = cross sectional area of the sensing electrodes in square meters (m2) d = distance between sensing electrodes in meters (m) Figure 15. Illustration of the theoretical projected capacitance equation C ε d A × () d ⁄ = |
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