An acoustic thermography as an additional support to infrared thermography
Abstract
A contrast in thermography is related to variations in temperature and emissions of surfaces analyzed. Typically, the interest focuses on temperature profiles, but they may be partly biased by the emissivity effect. Reflections on surface of system parts with radiation coming from other inner places as well as the effect of convective flows represent problems hindering a reading of thermal images in non-destructive tests. In this paper we developed a data acquisition system for 2D acoustic thermography to identify the effect of a convective flow reflection and complement the reading of images got by infrared thermography. So 40-kHz ultrasonic transducers were used to capture acoustic data, and we could obtain the temperature distribution in stationary conditions by hot air –gas– convection generated from heating components near surface.Downloads
Languages:
esReferences
Sadri A. (2005). "Non-destructive determination of and build-up thicknesses in operating furnaces using an acoustic ultrasonic reflection technique", Degradación de Materiales: Innovación, Inspección, Control y Rehabilitación, 44va Conferencia Anual de Metalurgistas del CIM, Calgary, Alberta, Canadá, pp. 371-385.
Sandri A., Gebski P., Rojas Verazay P., Ibañez R., Díaz Chinga W. (2008). "Inspection and Evaluation of Refractory Lining for Slag Cleaning Furnace and Teniente Reactor at Fudación Hernán VIdela Lira Empresa Nacional de Minería (ENAMI)", 5ta Reunión Internacional sobre Mantenimiento de Plantas Mineras, Santiago, Chile, pp. 85-96.
M. Ochs, T Horbach, A Schulz, R Koch and H-J Bauer (2009) "A novel calibration method for an infrared thermography system applied to heat transfer experiments" (Revista en linea) 075103, En: (http://iopscience.iop.org/0957-0233/20/7/075103)
Ning Z., Yong J., Seizo K., (2005) "Ultrasonic computerized tomography (CT) for temperature measurements with limited projection data based on extrapolated filtered back projection" (Revista en linea), pp.509-522. En:(www.sciencedirect.com) [Consulta: 2009, junio 11]
Iñiguez G (2007) "Clasificación mediante técnicas no destructivas y evaluación de las propiedades mecánicas de las maderas aserrada de coníferas de gran escuadría para uso estructural". (Resumen en linea) Tesis doctoral no publicada, Facultad de Física, Universidad Politécnica de Madrid. En: (http://oa.upm.es/415/) [Consulta: 2009, junio 14]
Soto, J., (1996). Fundamento sobre Ahorro de Energía. Yucatán., México: FOMES.
