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Vol. 150, No. 3, March 2013, pp. 27-31

 

Bullet

 

Improving the Accuracy of the Single Chip Impedance Analyzer for Sensor Applications

 

Bohdan STADNYK and Yuriy KHOMA

Department of Information and Measurement Technologies, Lviv Polytechnic National University, S. Bandera Str., 28, 79013, Lviv, Ukraine

Tel.: +38 (032) 258 76 14

E-mail: stadnyk@lp.edu.ua, khomay@gmail.com

 

 

Received: 13 January 2013   /Accepted: 19 March 2013   /Published: 29 March 2013

Digital Sensors and Sensor Sysstems

 

Abstract: The ways to use the single chip impedance analyzers AD5933 and AD5934 in various impedimetric sensor applications is presented. Spectral leakage impact on the accuracy of quadrature conversion based on algorithm of single-point Fourier transform across is scrutinized. The efficiency of the Hann and Blackman-Harris window functions for decreasing the leakage error is investigated. It is shown that application of the Hann window reduces leakage error in several times, but even though it remains on the unacceptable level (over 25 %). Significantly better results are achieved for the Blackman-Harris window (error can be reduced to 0.1 %).

 

Keywords: Single chip impedance analyzer, Quadrature conversion, Single-point Fourier transform, Leakage error, Window functions

 

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