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Investigation of Water Electrical Parameters as a Function of Measurement Frequency and Concentration Using Cylindrical Capacitive Sensors

Hosseinzadeh Fakhr, Mahan | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44994 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Golnabi, Hossein; Gobal, Fereydoon
  7. Abstract:
  8. The electrical conductivity of the solution has been one of the important physical quantities in many application. In this respect many probes and devices such as conductive sensors have been devised. In this study electrical properties of different water samples at frequency step range of 100-100000 Hz are measured by using the long cylindrical capacitive sensor and a measuring module (LCR-703). Operation of the capacitance measurement module for such probes is based on the auto balancing bridge method. Comparison of the measured capacitances and measured resistances for different water samples shows a decrease by increasing the measurement frequency. In another study the dielectric constant of distilled, mineral, boiled, tap and salt water are measured. The effect of the frequency on the conductivity, resistivity, permittivity and other electrical parameters of the different water samples are also investigated. For this experiment the conductivity of samples are also measured by the EC instrument and then by using the LCR module and the measured series resistance values the imaginary part of permittivity values for different liquid samples are determined. The imaginary part of the permittivity for the distilled water is the minimum value while for a conducting medium such as salt water solution is the highest value
  9. Keywords:
  10. Water ; Electrical Conductivity ; Frequencies ; Capacitance Sensor ; Dielectric Constant

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