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Development of a precise and accurate active bridge for the measurement of small capacitances of sensors / Haneeta Nur Binti Abd Jalil

DEVELOPMENT OF A PRECISE AND ACCURATE ACTIVE BRIDGE FOR THE MEASUREMENT OF SMALL CAPACITANCES OF SENSORS_Haneeta Nur Binti Abd Jalil_E3_2007_875000089_NI

Abstract This report exhibits on how to develop a precise and accurate active bridge for the measurement of small capacitance of sensors. First of all, the proposed active bridge‟s limitations, assumptions, and conditions are determined. When relationships among variables are obtained, then they can be used to get the actual results after fabricating the circuit and running tests on it. So there would be a guide on what is expected at the output. Fabricating the hardware is the hard part because a lot of external instruments were used, hence slight modifications need to be made to the active bridge circuit. Usually shielding in the circuit is used to reduce noise at the displayed output. The main aim of this project is to determine the error percentage of the capacitance readings and discussing the possible causes that may have caused the errors. All measurements have been made at 1 kHz when bridge is fully shielded. Effect of stray capacitances is reduced to minimum level by using proper shielding strategy.

Contributor(s): Haneeta Nur Abd Jalil - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875000089 Language: English Subject Keywords: fabricating; hence slight modifications; shielding First presented to the public: 5/1/2007 Original Publication Date: 1/10/2018 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Electrical & Electronic Engineering Citation: Extents: Number of Pages - 105 License Grantor / Date Granted:   / ( View License ) Date Deposited 2018-01-10 17:07:48.394 Date Last Updated 2019-01-07 11:24:32.9118 Submitter: Nor Hayati Ismail

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