Nondestructive and Noncontact Dielectric Measurement Methods for Transformer Oil Using Free-space Microwave Measurement System in 19 – 25 GHz Frequency Range
Journal Title: International Journal on Computer Science and Engineering - Year 2010, Vol 2, Issue 4
Abstract
Nondestructive, noncontact and real time evaluation of ielectric properties of low-loss liquids are important for applications such as service-aged transformer oil, biomedical, remote sensing and design of radar absorbing material. ree-space methods were developed to measure dielectric roperties of low-loss liquids at microwave frequencies. tal-back method was developed for Freespace Microwave easurement system (FSMM). The purpose of this research is to measure the dielectric properties of transformer il by using free-space microwave measurement system etween 18 – 26 GHz (K-band), to compare measured results with published results for transformer oil and to collect the variation values of dielectric properties in microwave frequency between 18GHz to 26GHz (k-band). FSMM system consists of spot focusing horn lens antennas, mode transitions, coaxial cables and vector network analyzer (VNA). Dielectric constants and loss factors were easured for new transformer oil and all results close agreed with published data. It is observed that metalback method is suitable for dielectric measurement of transformer oil.
Authors and Affiliations
M. Aziz, , A. K. Ermeey, , K. Jusoff
Keywords
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