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Proceedings Paper

Comparison of digital holographic interferometry and constant temperature anemometry for measurement of temperature field in fluid
Author(s): Roman Doleček; Pavel Psota; Vít Lédl; Tomáš Vít; Petra Dančová; Václav Kopecký
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Paper Abstract

The presented paper shows possibility of using digital holographic interferometry (DHI) for temperature field measurement in moving fluids. This method uses a modified Twymann-Green setup having double sensitivity instead of commonly used Mach-Zehnder type of interferometer in order to obtain sufficient phases change of the field. On the other hand this setup is not light efficient as Mach-Zehnder interferometer. For measurement of the fast periodical phenomenon is not necessary to use always the high speed camera. One can consider this field to coherent phenomenon. With employing one digital camera synchronized to periodic field and external triggered one can capture whole period of the phenomenon. However the projections form one viewing direction of asymmetrical temperature field maybe misguided. Hence for sufficient examination of the asymmetrical field one should capture a large number of the phenomenon’s projections from different viewing directions. This projections are later used for 3D tomographic reconstruction of the whole temperature field and its time evolution. One of the commonly used method for temperature field measurement in moving fluids is hot wire method - constant temperature anemometry (CTA). In contrast to whole field measurement of DHI it is an invasive point temperature measurement method. One of the limiting factor of using CTA in moving fluids is frequency of temperature changes. This changes should not exceed 1 kHz. This limitation could be overcome by using of optical methods such as DHI. The results of temperature field measurement achieved by both method are compared in the paper.

Paper Details

Date Published: 8 May 2015
PDF: 10 pages
Proc. SPIE 9508, Holography: Advances and Modern Trends IV, 95080P (8 May 2015); doi: 10.1117/12.2185056
Show Author Affiliations
Roman Doleček, Institute of Plasma Physics of the ASCR, v.v.i. (Czech Republic)
Technical Univ. of Liberec (Czech Republic)
Pavel Psota, Institute of Plasma Physics of the ASCR, v.v.i. (Czech Republic)
Technical Univ. of Liberec (Czech Republic)
Vít Lédl, Institute of Plasma Physics of the ASCR, v.v.i. (Czech Republic)
Technical Univ. of Liberec (Czech Republic)
Tomáš Vít, Institute of Plasma Physics of the ASCR, v.v.i. (Czech Republic)
Technical Univ. of Liberec (Czech Republic)
Petra Dančová, Technical Univ. of Liberec (Czech Republic)
Václav Kopecký, Technical Univ. of Liberec (Czech Republic)


Published in SPIE Proceedings Vol. 9508:
Holography: Advances and Modern Trends IV
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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