USING CAPACITIVE SENSING TO DETERMINE THE MOISTURE CONTENT OF WOOD PELLETS – INVESTIGATIONS AND APPLICATION

Publications

Share / Export Citation / Email / Print / Text size:

International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

GET ALERTS

eISSN: 1178-5608

DESCRIPTION

0
Reader(s)
0
Visit(s)
0
Comment(s)
0
Share(s)

VOLUME 2 , ISSUE 2 (June 2009) > List of articles

USING CAPACITIVE SENSING TO DETERMINE THE MOISTURE CONTENT OF WOOD PELLETS – INVESTIGATIONS AND APPLICATION

Anton Fuchs * / Michael J. Moser / Hubert Zangl / Thomas Bretterklieber

Keywords : Capacitive sensing, moisture content, wood pellets, screw conveyor

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 2, Issue 2, Pages 293-308, DOI: https://doi.org/10.21307/ijssis-2017-352

License : (CC BY-NC-ND 4.0)

Published Online: 03-November-2017

ARTICLE

ABSTRACT

This paper discusses a measurement principle for online moisture determination of wood pellets that is based on capacitive sensing. To ensure reliability and proper operation of the sensing device even under harsh industrial conditions, a robust principle based on a frequency hopping approach is required. Therefore, we investigate the impact of multiple carrier frequencies and analyze the frequency dependency of the material permittivity. Two different electrode topologies, one based on parallel plates and the other on a planar structure, are tested using a laboratory prototype in a drying chamber. Investigations on the applicability of capacitive moisture measurement are carried out using stationary conditions. The non-invasive and in-situ moisture content determination of wood pellets in a screw conveyor is presented as an application of the proposed principle.

Content not available PDF Share

FIGURES & TABLES

REFERENCES

[1] A. Fuchs, H. Zangl, G. Holler, "Capacitance-Based Sensing of Material Moisture in Bulk Solids: Applications and Restrictions", Part IV - Capacitive Sensors, Smart Sensors and Sensing Technology in Book Series Lecture Notes in Electrical Engineering, Springer- Verlag, 2008, pp. 235-248.
[2] I. McFarlane, "Control of Final Moisture Content of Food Products Baked in Continuous Tunnel Ovens", Measurement Science and Technology, vol. 17, 2006, pp. 241-248.
[3] L. Gradinarsky, H. Brage, B. Lagerholm, I. Björn, S. Folestad, "In Situ Monitoring and Control of Moisture Content in Pharmaceutical Powder Processes Using an Open-Ended Coaxial Probe", Measurement Science and Technology, vol. 17, 2006, pp. 1847-1853.
[4] A. Kraszewski, S. Trabelsi, S. Nelson, "Moisture Content Determination in Grain by Measuring Microwave Parameters", Measurement Science and Technology, vol. 8, 1997, pp. 857-863.
[5] M. Khoshbakht, M. Lin, "Development of an Electrical Time Domain Reflectometry (ETDR) Distributed Moisture Measurement Technique for Porous Media", Measurement
Science and Technology, vol. 17, 2006, pp. 2989-2996.
[6] A. Nagy, P. Vertes, "Correction for Dry Bulk Density in Measurements with Neutron Moisture Gauges", Journal of Scientific Instruments, vol. 2 (1), 1968, pp. 1097-1100.
[7] C. Edwards, G. Barwood, S. Bell, P. Gill, M. Stevens, "A Tunable Diode Laser Absorption Spectrometer for Moisture Measurements in the Low Parts in 109 Range, Measurement Science and Technology, vol. 12, 2001, p. 1214-1218.
[8] G. Brasseur, “Design Rules for Robust Cacacitive Sensors”, IEEE Transactions on Instrumentation and Measurement, vol. 52, no. 4, 2003, pp. 1261-1265.
[9] D. Wobschall, D. Lakshmanan, "Wireless Soil Moisture Sensor Based on Fringing Capacitance, Proc. of IEEE Sensors 2005, Irvine, California, October 31-November 3,
2005, pp. 8-11.
[10] M. Moser, A. Fuchs, H. Zangl, "Investigations on Capacitive Moisture Measurement in Screw-Conveyed Wood Pellets", Proc. of the Microelectronics Conference ME2008, October 15-16, 2008, Vienna, Austria, pp. 175-179.
[11] H. Serup (editor), "Wood for Energy Production, Technology - Environment – Economy”, Second revised edition, The Danish Center for Biomass Technology, 2002.
[12] P. Jensen, H. Hartmann, T. Böhm, M. Temmerman, F. Rabier, M. Morsing, "Moisture Content Determination in Solid Biofuels by Dielectric and NIR Reflection Methods",
Biomass and Bioenergy, vol. 30, 2006, pp. 935-943.
[13] A. Fuchs, M.J. Moser, H. Zangl, T. Bretterklieber, Investigations on the Impact of Different Carrier Frequencies for Capacitance Based Moisture Content Determination in Bulk Solids, to be published in Proc. of the 6th International Conference for Conveying and Handling of Particulate Solids, Brisbane, Australia, August 3-7, 2009.
[14] T. Bretterklieber, H. Zangl, M. Motz, T. Werth, D. Hammerschmidt, "Versatile Sensor Front End for Low-Depth Modulation Capacitive Sensors", Proc. of the IEEE International Instrumentation and Measurement Technology Conference, Vancouver Island, Canada, May 12-15, 2008, pp. 830-835.
[15] D. Hrach, H. Zangl, A. Fuchs, T. Bretterklieber, "A Versatile Prototyping System for Capacitive Sensing", Sensors and Transducers Journal, vol. 90, 2008, pp. 117-127.
[16] W. L. James, “Dielectric Properties of Wood and Hardboard: Variations with Temperature, Frequency, Moisture Content, and Grain Orientation”, USDA Forest Service Research Paper, FPL 245, 1975.
[17] C. Rorres: The Turn of the Screw: Optimal Design of an Achimedes, Screw, Journal of Hydraulic Engineering, vol. 126, no. 1, 2000, pp. 72-80.
[18] J. Dai, J. Grace, A Model for Biomass Screw Feeding, Powder Technology, 2007, Article in Press, DOI:10.1016/j.powtec.2007.10.032.
[19] A. Fuchs, H. Zangl, G. Brasseur, Mass Flowmeter for Screw Conveyors Based on Capacitive Sensing. Proc. of the IEEE Instrumentation and Measurement Technology
Conference, Warsaw, Poland, May 1-3, 2007, pp. 1-5.
[20] M.J. Moser, A. Fuchs, H. Zangl, Non-Invasive Capacitive Sensor for the Determination of Revolution Speed and Fill Level in Screw Conveyors, Proc. of the 7th IEEE Conference on Sensors 2008, Lecce, Italy, October 26-29, 2008, pp. 49-52.

EXTRA FILES

COMMENTS