Detection of moisture in porous materials through infrared methods

• Autorzy: Furmański P. , Wiśniewski T. , Wyszyńska E.
• Języki publikacji: EN

Abstrakty

EN

Presence of liquid water is one of the agents responsible for damage of materials. A study on determination of the liquid water content in porous materials was carried out in the paper. At first a review of methods for moisture detection was performed. Then a new quantitative method, based on IR observation of variation in the surface temperature of the moist sample in the humid environment, is proposed. The mathematical model for the method was based on the fundamental assumption that the liquid phase appears in thermodynamic equilibrium with the water vapour in pores of the material. Analysis of the simplified solutions of the mathematical model is carried out for a common, red brick and relations between the water content and experimentally measurable parameters are presented. Finally, preliminary measurements on the moist material are done on a specially designed experimental stand using the infrared camera. It follows that the transient part of the surface temperature response is most suitable for determination of the water content in the porous material.

Słowa kluczowe

EN

IR non-destructive detection; measurement method normalsize; moisture content

PL

metoda pomiaru; nieniszcząca detekcja; podczerwień; wilgotność

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2008
• Tom: Vol. 29, no. 1
• Strony: 19--39
• Opis fizyczny: Bibliogr. 13 poz.,rys., tab., wykr., wz.

Twórcy

autor

Furmański P.

autor

Wiśniewski T.

autor

Wyszyńska E.

• Warsaw University of Technology, Institute of Heat Engineering, ul. Nowowiejska 25, 00-665 Warszawa,

Bibliografia

• [1] AVDELIS N.P., A. MOROPOULOU, P. THEOULAKIS: Detection of water deposits and movement on porous materials by infrared imaging, Infrared Physics & Technology, Vol. 44, 2003, 183-190.
• [2] BÜSCHER K.A., H. WIGGENHAUSER, W. WILD: Amplitude sensitive modulation-thermography the new way of moisture measurement in building materials, QIRT J., Proc. of Eurotherm Seminar, 1998, 184-190.
• [3] DANIEL I.M., ISHAI O.: Hygrothermal Effects in Engineering Mechanics of Composite Materials, Oxford University Press, 1994.
• [4] DELGADILLO-HOLTFORT I. PELZL J., B.K. BEIN: Control of drying by means of IR detection of thermal waves, QIRT J, Proc. of Eurotherm Seminar, 2000, 230-235.
• [5] GAYO E., J. DE FRUTOS, A. PALOMO, S. MASSA: A mathematical model simulating the evaporation processes in building materials: Experimental checking through infrared thermography, Building and Environment, Vol. 31, 1996, 469-475.
• [6] GAYO E., J. DE FRUTOS: Interference filters as an enhancement tool for infrared thermography in humidity studies of building elements, Infrared Physics & Technology, Vol. 38, 1997, 251-258.
• [7] HÜTTNER R., E. SCHOLLMEYER: The on-line detection of moisture and moist coatings by means of thermal waves, QIRT J., Proc. of Eurotherm Seminar, 1996, 215-219.
• [8] MILAZZO M., LUDWIG N., G. POLDI: Moisture detection in walls through measurement of temperature, QIRT J., Proc. of Eurotherm Seminar, 1998, 91-96.
• [9] SALMON D.R., TYE R.P.: Measurements of thermal and moisture properties of moist masonry materials: Issues and problem areas, Thermal Conductivity, Vol. 27, 2004,207-221.
• [10] TAVUKCUOGLU A., E. GRINZATO: Determination of critical moisture content in porous materials by IR Thermography, QIRT J., Vol. 3, 2006, 231-245.
• [11] VAVILOV V.P., NESTERUK D.A.: Detecting water in aviation honeycomb structures: the quantitative approach, QIRT J., Vol. 1, 2004, 151-172.
• [12] WIGGENHAUSER H.: Active IR-applications in civil engineering, Infrared Physics & Technology, Vol. 43, 2002, 233-238.
• [13] WYRWAŁ J., A. MARYNOWICZ: Vapour condensation and moisture accumulation in porous building wall, Building and Environment, Vol. 37, 2002, 313-318.