Experimental Confirmation of Cylindrical Electromagnetic Sensor Design for Liquid Detection Application
Design of cylindrical electromagnetic sensor is discussed. The purpose of this sensor is to detect a change in the conductivity or permittivity of the liquid. If the evaluation frequency is less than 100 kHz, skin effects would be negligible. The proposed sensor consists of two cylindrical sensors, a solenoid coil and a cylindrical capacitor. For an ideal shape condition, estimation methods for inductance and capacitance have been already proposed. However, the practical issues need to be clarified. It starts with fabrication of several coils and capacitors, to confirm the validity of the estimation methods. From experimental results, it was found that, the estimation error and existence of the parasitic element could not be neglected. Liquid detection demonstrations with fabricated sensors are also demonstrated.
KeywordsLiquid detection sensor Electromagnetic field Low-frequency Cylindrical capacitor Solenoid coil
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- 1.Abe, T., Shinozawa, Y., Machida, T., Yamada, K.: Device for judging types of liquid in container and control method therefor, US Patent, US7466236B2 (2008)Google Scholar
- 5.Korostynska, O., Mason, A., Al-Shamma’a, A.I.: Proof-of-concept microwave sensor on flexible substrate for real-time water composition analysis. In: 2012 Sixth International Conference on Sensing Technology (ICST 2012), pp. 547–550 (2012)Google Scholar
- 6.Yunus, M.A.M., Mukhopadhyay, S.C.: Development of planar electromagnetic sensors for measurement and monitoring of environmental parameters. Meas. Sci. Technol. 22, 025107(9p.) (2011)Google Scholar
- 11.National Astronomical Observatory of Japan. Chronological science tables. Maruzen Publishing Co. Ltd. (2005) (in Japanese)Google Scholar
- 12.Hastings, H.: Approximations for digital computers (Sheet No. 46 and 49), Princeton (1955) (This information referred to a Japanese book: Moriguchi, S., Udagawa, K., Hitomatsu, S.: IWANAMI SUUGAKU KOUSHIKI, 22nd edn., vol. III, pp. 79–81. Iwanami Publishing (2010)Google Scholar
- 13.Nagaoka, H.: The inductance coefficients of solenoids. Journal of the College of Science XXVII, Article 6 (1909), http://repository.dl.itc.u-tokyo.ac.jp/dspace/bitstream/2261/32855/1/jcs027006.pdf
- 14.Omoto, Y., Morita, K.: On the electrode capacity of magnetron tube. Journal of IEEJ 60(619), 61–62 (1940), http://dx.doi.org/10.11526/ieejjournal1888.60.61 (in Japanese)
- 15.Kogo, H.: Electrode Capacity of Split-Coaxial Cylinder. Research Reports of Faculty of Technology 6(10), 54–67 (1955) (in Japanese)Google Scholar
- 16.Oka, S.: Theory of dielectric, pp. 191–195. Gendaikougakusha Co. Ltd. (1977) (in Japanese)Google Scholar