Determination of Two-Liquid Mixture Composition by Assessing Dielectric Parameters 1. Precise Measuring System / Divu Šķidrumu Maisījuma Sastāva Noteikšana, Izvērtējot to Dielektriskos Parametrus 1. Precīza Mērīšanas Sistēma
Concentration measurements are important in bioethanol industries, in the R&D areas, for chemical, medical and microbiological analyses and processing as well as for diagnostics, manufacturing, etc. The overview shows development of the structural design of a system for measuring the concentration of solutions and mixtures consisting of two dielectric liquids. The basic principles of the system's design are given along with relevant equations. The concentration of dielectric liquids is measured using devices with capacitive sensors (1-300 pF). The operational frequency of the developed measuring system is 100.000 kHz. Configuration of the system excludes some errors usually arising at measurements, and broadens its applicability. For testing, the system was calibrated for measuring the concentration of anhydrous ethanol + de-ionized water mixture. Experimental results have shown a stable resolution of ±0.005 pF at measuring the sensor capacitance and a reproducible resolution better than ±0.01% at measuring the ethanol volume concentration
If the inline PDF is not rendering correctly, you can download the PDF file here.
1. Lucas Conçalves Dias Mendonça Delson Torikai Ricardo Cury Ibrahim Eliphas Wagner Simoes & Nilton Itiro Morimoto (2008). Interdigitated-type capacitive sensor to verify the quality of ethanol automotive fuel. ABCM Symposium Series inMechatronics (3) 580-585.
2. Berggren C. Bjarnason B. & Johansson G. (2001). Capacitive Biosensors. Electroanalysis13 (3) 173-181.
4. van der Ploeg J.P.M. & Mandel M. (1991). A low frequency relative permittivity meter for electrically conducting liquids. Meas. Sci. Technol. (2) 389-395.
5. Asrulnizam Bin Abd Manaf & Matsumoto Y. (2009). Low voltage charge-balanced capacitance-voltage conversion circuit for one-side-electrode-type liquid-based inclination sensor. Solid-State Electronics 55 63-69.
6. Majid H.A. Razali N. Sulaiman M.S. & A’ain A.K. (2009). A capacitive sensor interface circuit based on phase differential method. World Academy of Science Eng.& Technol. 55 636-639.
7. Balaya P. & Sunandana C.S. (1989). A PSD-based electronic system for AC response studies of superionic conductors. Ind. J. Phys. 33 (6) 627-637.