Measurement of the distribution of temperature and emissivity of a candle flame using hyperspectral imaging technique

Zheng, Sining; Li, Ni; Liu, Huawei; Zhou, Huaichun

doi:10.1016/j.ijleo.2019.02.077

Cited by 27 publications

(18 citation statements)

References 25 publications

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“…This range is used to calculate the temperature. In sequence the flame temperature is recalculated using the equation (4) considering the flame emissivity. After few iterations, the result converges.…”

Section: Resultsmentioning

confidence: 99%

“…Measurements of the temperature and emissivity (dependent on the wavelength) of a laminar diffusion flame using hyperspectral images is carried out in [3]. And in [4] is present the measurement of the temperature distribution and emissivity of a candle flame using hyperspectral images. In both works a polynomial model was used to represent emissivity as a function of wavelength.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous Biomass Flame Temperature and Spectral Emissivity Estimation by Inverse Method

Salinas¹,

Gonzales²,

Cândido³

et al. 2021

14th WCCM-ECCOMAS Congress

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This work presents a numerical and experimental study in a laboratorial rig to measure local flame temperature during the biomass combustion. Most of practical situations of biomass combustion is a transient and non-stable phenomenon. A spectral analysis method in the visible spectrum range was used for measurement of local temperatures in a sugarcane bagasse flame. The two-color method considering spectral flame emissivity variation joint with an inverse numerical procedure is used to simultaneous estimation of flame temperature and spectral emissivity. Also, a sequential iterative numerical procedure is tested. It includes the application of two-color method considering grey emissivity between two near spectral intensity data in a first step. In a second step and iterative procedure considering spectral emissivity variation along whole spectral range is applied. To apply the numerical methods was used several spectral intervals in the visible range. In inverse estimation, the Levenberg-Marquardt method is used and a polynomial and a cosine models for estimation of coefficients were tested. Six test of biomass combustion were made focusing the sensor to the reaction zone, and spectral data collected. The flame temperature estimated for the six spectral data were closed to 1530 to 1540 K. Also, the spectral emissivity is closed in all sixcombustion test. Instantaneous bagasse flame temperature in the range of 1400 K to 1500 K in the reactive combustion zone were found. An image processing method was used to measure the temperature in the same reactive combustion zone and the comparison show

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous Biomass Flame Temperature and Spectral Emissivity Estimation by Inverse Method

Salinas¹,

Gonzales²,

Cândido³

et al. 2021

14th WCCM-ECCOMAS Congress

View full text Add to dashboard Cite

show abstract

“…Thus, electron density trajectories (e.g., the solar corona with polynomial expressions) should be a parameter for oxygen sensing in PoC devices. In a candle flame, the intense combustion reactions attribute to its highest temperature region (2200 K) (Zheng et al, 2019) and should provide the amount of available oxygen.…”

Section: Physical Chemistry Of Plasmamentioning

confidence: 99%

Towards Real-Time Oxygen Sensing: From Nanomaterials to Plasma

Vinitha

Chinmaya

CV³

et al. 2022

Front. Sens.

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A significantly large scope is available for the scientific and engineering developments of high-throughput ultra-high sensitive oxygen sensors. We give a perspective of oxygen sensing for two physical states of matters—solid-state nanomaterials and plasma. From single-molecule experiments to material selection, we reviewed various aspects of sensing, such as capacitance, photophysics, electron mobility, response time, and a yearly progress. Towards miniaturization, we have highlighted the benefit of lab-on-chip-based devices and showed exemplary measurements of fast real-time oxygen sensing. From the physical–chemistry perspective, plasma holds a strong potential in the application of oxygen sensing. We investigated the current state-of-the-art of electron density, temperature, and design issues of plasma systems. We also show numerical aspects of a low-cost approach towards developing plasma-based oxygen sensor from household candle flame. In this perspective, we give an opinion about a diverse range of scientific insight together, identify the short comings, and open the path for new physical–chemistry device developments of oxygen sensor along with providing a guideline for innovators in oxygen sensing.

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“…Colour CCD cameras were used to investigate the simultaneous measurement of temperature distribution and radiative properties by radiation analysis [3]. From measurements of the temperature distribution in a candle flame, it was determined that the behaviour of emissivity is approximately inverse to that of wavelength [4]. To improve the accuracy of the temperature calculation, a multi-wavelength technique was proposed to introduce an emissivity ratio model to replace the grey body assumption.…”

Section: Introductionmentioning

confidence: 99%

Flame temperature and alkali emission in combustion of sugarcane bagasse and straw

et al. 2021

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This work presents a numerical and experimental study in a laboratorial rig to measure local flame temperature and alkali emission during the combustion of sugarcane bagasse and straw. Tubular combustion chamber to simulate combustion in grate is used. A spectral analysis method in the visible spectrum was used for measurement of local temperatures in a sugarcane bagasse flame and sugarcane straw flame. The two-color method is used to calculate flame temperature. In flame reactive zone, the bagasse and straw flame temperatures in the range of 1420 to 1510 K and in the range of 1450 to 1550 K respectively are calculated. The intensity of alkali emission during the sugarcane bagasse and straw combustion is calculated using data of the spectrum in visible range. It was found that potassium emission is correlated with the instantaneous bagasse flame temperature in the reactive combustion zone. Emission of potassium and sodium during straw combustion is higher than in bagasse combustion. Temperature and alkali emissions along the flame height are measured.

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Measurement of the distribution of temperature and emissivity of a candle flame using hyperspectral imaging technique

Cited by 27 publications

References 25 publications

Simultaneous Biomass Flame Temperature and Spectral Emissivity Estimation by Inverse Method

Simultaneous Biomass Flame Temperature and Spectral Emissivity Estimation by Inverse Method

Towards Real-Time Oxygen Sensing: From Nanomaterials to Plasma

Flame temperature and alkali emission in combustion of sugarcane bagasse and straw

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