Determination of Surface Moisture Content of Wood Utilizing a Colorimetric Technique


  • Hwanmyeong Yeo
  • William B. Smith
  • Robert B. Hanna


Cobalt chloride (CoCl<sub>2</sub>) hydrate, colorimetric technique, surface moisture content, CIE L<sup>*</sup>a<sup>*</sup>b<sup>*</sup>, spectrophotometer


Optical properties of cobalt chloride (CoCl2) hydrate, whose color changes with surrounding humidity, were used to develop a colorimetric technique for determining surface moisture content of wood nondestructively. The colorimetric CoCl2 treated wood technique for determining surface moisture content through color degree change in CIE L*a*b* color space has been experimentally verified.


Chrisment, A. 1998. Color and colorimetry. Ed. 3C. Conseil, Paris. 30 pp.nCIE. 1986. Colorimetry. CIE Publication No 15.2. 2nd Ed. Commission Internationale de l'Eclairage, Vienna, Austria. 74 pp.nCoera, F. P., A. Gaston, and J. Sevilla. 2000. Relative humidity sensor based on side-polished fiber optic. Proc. 17th IEEE Instrumentation and Measurement Technology Conference, Baltimore, MD. 1:17-22.nDybko, A., W. Wroblewski, E. Rozniecka, J. Maciejewski, and Z. Brzozka. 1999. Comparison of two thermochromic solutions for fiber optic temperature probes. Sensors and Actuators A (Physical) A76:203-207.nHill, B., T. Roger, and F. W. Vorhagen. 1997. Comparative analysis of the quantization of color spaces on the basis of the CIE LAB color-difference formula. ACM Trans. Graphics 16(2):109-154.nHypszer, R., and H. J. Wierzba. Fiber optic technique for relative humidity sensors. 1997. Proc. SPIE—Int. Society for Optical Engineering 3054:145-150.nKawamura, M., T. Takeuchi, H. Faud, and S. Sato. 1999. Feb. Humidity and temperature sensing using an optical fiber and a corner cube prism. Jap. J. Appl. Physics, Part 1. 38(2A):849-850.nKharaz, A., and B. E. Jones. 1995. A distributed optical-fiber sensing system for multipoint humidity measurement. Sensors and Actuators A (Physical) A46-47:491-493.nKollmann, F. F. P., and W. A. Côté. 1968. Principles of wood science and technology. Vol. I. Solid Wood. Springer-Verlag, New York, NY. 592 pp.nOtsuki, S., and K. Adachi. 1993. Humidity dependence of visible absorption spectrum of gelatin film coating cobalt chloride. J. Appl. Polymer Sci. 48(9):1557-1564.n






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