Abstract
This research demonstrates an effective in-situ testing approach to measure permittivity of liquid samples within a container using microwaves. An open-ended waveguide is employed as a sensor in the experiment. This apparatus is easy-to-use because it does not require special calibration and is not limited by sample shape or dimensions. After positioning the bottle inside the open-ended waveguide and adding a layer of surrounding medium that fills the space between waveguide and the bottle, the waveguide functions as a resonant cavity. By analyzing the \(S_{11}\) amplitude waveform over the frequency range from 250 to 550 MHz, the resonant frequencies can be obtained for a certain propagating mode. The measured values are found to match the theoretical ones extremely well; this result implies that the new establishment is highly precise and sensitive.
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Jiang, Y., Ju, Y. & Yang, L. Nondestructive In-situ Permittivity Measurement of Liquid Within a Bottle Using an Open-Ended Microwave Waveguide. J Nondestruct Eval 35, 7 (2016). https://doi.org/10.1007/s10921-015-0322-8
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DOI: https://doi.org/10.1007/s10921-015-0322-8