Digital holographic interferometry for measurement of temperature in axisymmetric flames

Abstract

In this paper, experimental investigations and analysis is presented to measure the temperature and temperature profile of gaseous flames using lensless Fourier transform digital holographic interferometry. The evaluations of the experimental results give the accuracy, sensitivity, spatial resolution, and range of measurements to be well within the experimental limits. Details of the experimental results and analysis are presented.

Facile template-free synthesis of multifunctional 3D cellular carbon from edible rice paper

“…The setup was maintained in the ame for at least 15 minutes. The temperature of candle ame can reach up to 1200 C. 80,81 However, the cotton (which spontaneously burns at around 300 C (ref. 82)) never caught re during the entire duration (Fig.…”

Measurement of natural convective heat transfer coefficient along the surface of a heated wire using digital holographic interferometry

“…2(a)]. In case of axisymmetric objects, the phase difference obtained can be transformed into a radial distribution of the index of refraction by using inverse Abel transforms [23]:…”

“…A large number of optical interferometric methods exist, such as classical interferometry [6,7], holographic interferometry [8][9][10], speckle photography [11,12], shearing interferometry [13,14], moire deflectometry [15], speckle shearing interferometry [16], Talbot interferometry [17,18], and Lau phase interferometry [19,20]. Recently, digital holographic interferometry (DHI) has been investigated for the measurement of the temperature and temperature profiles of gaseous flames and heated objects [21][22][23][24][25][26]. DHI is expected to provide a more accurate value of the local convective heat transfer coefficient (h) as the temperature gradient required for the calculation of "h" can be obtained more accurately than by other existing optical interferometric techniques.…”

Stochastic digital holography for visualizing inside strongly refracting transparent objects

“…Then, observing physical phenomena, such as refractive index variations, convection currents, or thermal gradients, occurring inside the object require specific methods. The approaches proposed in the past [29,[47][48][49][50][51][52][53][54] are very powerful to measure flows or temperature fields and very appropriated when the envelope including the gas/liquid is relatively smooth and transparent (i.e., not strongly refracting).…”