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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/13977

Title: Practical and Simple Circuitry for the Measurement of Small Capacitance
Authors: Lin, D. Y.;Wu, J. D.;Chang, Y. J.;Wu, Jenq-Shinn
Contributors: 電子工程學系
Date: 2007-01
Issue Date: 2012-09-10T02:34:09Z
Publisher: American Institute of Physics
Abstract: Practical and cost-effective circuitry with high sensitivity has been developed to measure a small capacitance using current compensation method. The circuitry uses an electronic switch to periodically connect or separate the capacitor under test Cx from a reference capacitor Cr . When Cx is connected in parallel with Cr the total capacitance becomes Cx+Cr. On the other hand, as Cx is separated from Cr, the total capacitance is only Cr. This periodic change of the capacitance generates a periodic square-wave output with an amplitude in proportion to the capacitance of Cx. A high sensitivity of V/ C=202.2 mV/pF has been achieved, making the circuitry a powerful tool in measuring small capacitances. Three applications have been performed to present its capability: a displacement, b height of liquid, and c angle of tilt. The experimental results demonstrate the performance of the circuitry.
Relation: Review of Scientific Instruments, 78: 014703
Appears in Collections:[電子工程學系] 期刊論文

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