Abstract
In this paper, we present a method of quantitatively measuring in real-time the dynamic temperature field change and visualization of volumetric temperature fields generated by a 2D axial-symmetric heated fluid from a pulsatile jet in a water tank through off-axis digital holographic interferometry. A Mach-Zehnder interferometer on portable platform was built for the experimental investigation. The pulsatile jet was submerged in a water tank and fed with water with higher temperature. Tomographic approach was used to reconstruct the temperature fields through the Abel Transform and the filtered back-projection. Averaged results, tomographic view, standard deviation and errors are presented. The presented results reveal digital holographic interferometry as a powerful technique to visualize temperature fields in flowing liquids and gases.
Highlights
Measurement of SymmetricalThe wide range of applications of liquids and determining their properties, especially the temperature changes within the working fluid, play a key role in many sectors of industry and research
Temperature values measured through off-axis digital holographic interferometry are relative, meaning that a starting point must be a priori known
Digital holographic interferometric methodology for the measurement of temperReal-time dynamic temperature field change and visualization of volumetric temperature ature fields through the analysis of the refractive index variation has been implemented
Summary
Measurement of SymmetricalThe wide range of applications of liquids and determining their properties, especially the temperature changes within the working fluid, play a key role in many sectors of industry and research. Depending on the application, determining such temperature changes can be a crucial step in determining the end-result and efficiency of the process. For this reason, determining temperature changes through non-contact, non-destructive optical methods is very convenient. The direct phase retrieval and its differential nature, make digital holographic interferometry an attractive tool for the study of heat transfer phenomena [5]. It provides high spatial and temporal resolution and with automation of the recording and reconstruction process, real time visualization is possible [6,7]
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