Temperature measurement of axi- symmetric butane diffusion flame under the influence of upward decreasing gradient magnetic field using digital holographic interferometry

Varun Kumar; Manoj Kumar; Chandra Shakher

doi:10.1117/12.2196396

24 August 2015 Temperature measurement of axi- symmetric butane diffusion flame under the influence of upward decreasing gradient magnetic field using digital holographic interferometry

Varun Kumar, Manoj Kumar, Chandra Shakher

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Proceedings Volume 9660, SPECKLE 2015: VI International Conference on Speckle Metrology; 96600I (2015) https://doi.org/10.1117/12.2196396
Event: SPECKLE 2015: VI International Conference on Speckle Metrology, 2015, Guanajuato, Mexico

Abstract

In this paper, digital holographic interferometry (DHI) is implemented to investigate the effect of upward decreasing gradient magnetic field on the temperature and temperature profile of diffusion flame created by butane torch burner. In the experiment double exposure digital holographic interferometry is used to calculate the temperature distribution inside the flame. First a digital hologram is recorded in the absence of flame and second hologram is recorded in the presence of flame. Phases in two different states of air (i.e. in absence of flame and presence of flame) are reconstructed individually by numerical method. The phase difference map is obtained by subtracting the reconstructed phase of air in presence and absence of flame. Refractive index inside the flame is obtained from the axi-symmetric phase difference data using the Abel inversion integral. Temperature distribution inside the flame is calculated from the refractive index data using Lorentz - Lorentz equation. Experiment is conducted on a diffusion flame created by butane torch burner in the absence of magnetic field and in presence of upward decreasing gradient magnetic field. Experimental investigations reveal that the maximum temperature inside the flame increases under the influence of upward decreasing magnetic field.

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Varun Kumar, Manoj Kumar, and Chandra Shakher "Temperature measurement of axi- symmetric butane diffusion flame under the influence of upward decreasing gradient magnetic field using digital holographic interferometry", Proc. SPIE 9660, SPECKLE 2015: VI International Conference on Speckle Metrology, 96600I (24 August 2015); https://doi.org/10.1117/12.2196396

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KEYWORDS

Magnetism

Digital holography

Holograms

Refractive index

Temperature metrology

Diffusion

Holographic interferometry

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