Towards Fast In-line Measurement of Water Activity

详细信息    查看全文

• 作者：J. Nielsen ; M. B. Andreasen ; M. Pedersen…
• 关键词：In ; line measurement ; Modeling ; Relative humidity ; Sampling ; Water activity
• 刊名：International Journal of Thermophysics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：36
• 期：2-3
• 页码：577-588
• 全文大小：592 KB
• 参考文献：1. P.R. Wiederhold, / Water Vapor Measurement (Marcel Dekker Inc., New York, 1997), p. 230
  2. JCGM 100:2008, Evaluation of Measurement Data-Guide to the Expression of Uncertainty in Measurement, http://www.bipm.org
  3. A.S. Mujumdar, / Handbook of Industrial Drying, vol. 3 (Taylor & Francis, New York, 2007)
  4. R. Mokhutshoane, J. Nielsen, C. Barendregt, M.J. de Groot, The Set-Up and Characterization of a Calibration System for Dewpoint Meters and Relative Humidity Sensors, in / Proceedings of 4th ISHM ed. by C. Hsu (Taipei, ITRI, 2002), pp. 493-99
  5. J. Nielsen, J. Lovell-Smith, M.J. de Groot, S. Bell, Uncertainty in the Generation of Humidity, CCT/03-20 (BIPM, Sèvres Cedex, France, 2003)
  6. J. Lovell-Smith, J. Nielsen, in / Proceedings of TEMPMEKO 2004, 9th International Symposium on Temperature and Thermal Measurements in Industry and Science, ed. by D. Zvizdi?, L.G. Bermanec, T. Veliki, T. Sta?i? (FSB/LPM, Zagreb, Croatia, 2004), pp. 945-50
  7. M. Heinonen, M. Anagnostou, S. Bell, M. Stevens, R. Benyon, R.A. Bergerud, J. Bojkovski, R. Bosma, J. Nielsen, N. B?se, P. Cromwell, A.K. Dogan, S. Aytekin, A. Uytun, V. Fernicola, K. Flakiewicz, B. Blanquart, D. Hudoklin, P. Jacobson, A. Kentved, I. Lóio, G. Mamontov, A. Masarykova, H. Mitter, R. Mnguni, J. Otych, A. Steiner, N.S. Zsófia, D. Zvizdic, Int. J. Thermophys. 33, 1422 (2012) CrossRef
  8. D. Hudoklin, J. Setina, J. Drnovsek, Int. J. Thermophys. 33, 1595 (2012) CrossRef
  9. http://www.metef.net. Accessed 9 Sept 2014
  10. M.B. Gencturk, A.S. Bakshi, Y.C. Hong, T.P. Labuza, J. Food Process Eng. 8, 243 (1986) CrossRef
  
• 作者单位：J. Nielsen (1)
  M. B. Andreasen (1)
  M. Pedersen (1)
  M. K. Rasmussen (1)
  
  1. Danish Technological Institute, Aarhus, Denmark
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Mechanics
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-9567

文摘

Water activity is widely used as a key parameter in controlling the quality of food and feed products, among others. For determining the water activity, the material is sampled from the manufacturing process and measured in the laboratory with water activity analyzers. The sampling procedure can lead to non-representative measurements, the measurement process is time consuming, and much of the produced material may be wasted before the measurement results are available. To reduce waste and to be able to optimize production processes, industry requires in-line measurement of relevant quality determining parameters, hereunder the water activity. In cooperation with a manufacturer of systems for automatic in-line sampling and measurement of moisture, density, and the size of items, a project was defined to also enable the manufacturer’s existing products to perform automatic measurement of the water activity in a sample. The aim was to develop a measurement system with the ability to operate in an industrial environment, which in the end would increase the measurement speed significantly and minimize the problems related to the handling of samples. In the paper the selection and characterization of the sensors, the design of a measurement chamber, and various issues of modeling and methods to reduce measurement time are discussed. The paper also presents water activity measurements obtained from food and feed products with the system, and shows that reliable results can be obtained in a few minutes with a proper design of the measurement chamber and selection of a model.