Three-dimensional reconstruction of flame temperature and emissivity distribution using optical tomographic and two-colour pyrometric techniques

Hossain, Md. Moinul; Lü, Gang; Sun, Duo; Yan, Yong

doi:10.1088/0957-0233/24/7/074010

Cited by 105 publications

(57 citation statements)

References 33 publications

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“…Niu et al [3] employed a hybrid LSQR-PSO (least-square QR decomposition-particle swarm optimization) algorithm to estimate the 3-D temperature distributions and absorption coefficient simultaneously with known radiative intensity of the flame detected by a hypothetical plane. Several multicameras based tomographic and laser based diagnostics techniques were also reported to reconstruct the 3-D temperature distribution of the flames [4][5][6][7]. However, multicameras techniques are in high system cost, complexity in system setup and installation and laser based diagnostics techniques require more complex system and unsuitable for industrial furnaces due to the complex setup, high cost of the system setup.…”

Section: Geometric Calibration Of Focused Light Field Camera For 3-d mentioning

confidence: 99%

Geometric calibration of focused light field camera for 3-D flame temperature measurement

Sun

Zhang

Wang

et al. 2016

2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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Abstract-Focused light field camera can be used to measure three-dimensional (3-D) temperature field of a flame because of its ability to record intensity and direction information of each ray from flame simultaneously. This work aims to develop a suitable geometric calibration method of focused light field camera for 3-D flame temperature measurement. A modified method based on Zhang's camera calibration is developed to calibrate the camera and the measurement system. A single focused light-field camera is used to capture images of bespoke calibration board instead of flame images in this study. Geometric parameters including intrinsic (i.e., camera parameters) and extrinsic (i.e., camera connecting with the calibration board) of the focused light field camera are calibrated to trace the ray projecting onto each pixel on CCD (chargecoupled device) sensor. Instead of using line features, corner point features are directly utilized for the calibration. The characteristics of focused light field camera including one 3-D point corresponding to several image points and matching main lens and microlens f-numbers, are used for calibration. Results with a focused light field camera are presented and discussed. Preliminary the 3-D temperature distribution of a flame is also investigated and presented.

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Section: Geometric Calibration Of Focused Light Field Camera For 3-d mentioning

confidence: 99%

Geometric calibration of focused light field camera for 3-D flame temperature measurement

Sun

Zhang

Wang

et al. 2016

2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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“…Photodiodes are incorporated in the 2-D imaging system to measure the oscillation frequency and stability of the flame. These techniques provide digital images and videos of the flame as well as computer tomographic reconstruction of the flame in 3-D [3]. As noted above, experimental work has been undertaken on the 250 kW solid fuel combustion test facility to assess the performance and operability of the systems (see also Fig.…”

Section: -D and 3-d Imaging Systems For Monitoring Analysis And Diamentioning

confidence: 99%

OxyCAP UK: Oxyfuel Combustion - academic Programme for the UK

et al. 2014

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The OxyCAP-UK (Oxyfuel Combustion -Academic Programme for the UK) programme was a £2M collaboration involving researchers from seven UK universities, supported by E.On and the Engineering and Physical Sciences Research Council. The programme, which ran from November 2009 to July 2014, has successfully completed a broad range of activities related to development of oxyfuel power plants. This paper provides an overview of key findings arising from the programme. It covers development of UK research pilot test facilities for oxyfuel applications; 2-D and 3-D flame imaging systems for monitoring, analysis and diagnostics; fuel characterisation of biomass and coal for oxyfuel combustion applications; ash transformation/deposition in oxyfuel combustion systems; materials and corrosion in oxyfuel combustion systems; and development of advanced simulation based on CFD modelling.

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“…By combining WMS with tomography techniques, the distributions of temperature and mole fractions of chemical species can be reconstructed. Because the flame produced by the flat-flame burner under normal conditions is axisymmetric, the typical tomography modalities, each with multiple views and projections [17][18][19][20][21], can be simplified as one-dimensional tomography that only uses one view of multiple parallel beams [22,23].…”

Section: Introductionmentioning

confidence: 99%

Resolution-doubled one-dimensional wavelength modulation spectroscopy tomography for flame flatness validation of a flat-flame burner

Liu

et al. 2015

Appl. Phys. B

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mechanisms and heat transfer processes [1,2]. They are also used as important combustion devices in development and calibration of optical diagnostic techniques [3][4][5][6][7]. Generally, the premixed flame of the flat-flame burner is axisymmetric and assumed to be flat in a radial direction. In other words, distributions of temperature and mole fractions of chemical species on a cross section of the flame are assumed to be uniform in the radial direction. The flame flatness is one of the most critical factors in evaluating the performance of the flat-flame burner. On the one hand, when calibrating optical diagnostic instruments, a clear separation is required between the region of interest, i.e., the core flame, and the regions which are not of interest, i.e., surrounding air. On the other hand, to obtain accurate flame parameters from equilibrium calculations, temperature and mole fractions of chemical species are required to be as constant as possible throughout the core flame. Therefore, the flat-flame burner should be well designed to ensure the flame as flat as possible.To produce a flat flame, the burner plug is always ringed with shrouding nitrogen to isolate core flame from air disturbance [4,8]. However, the effects of heat transfer between the core flame and the cold boundary of air are inevitable, which lead to non-uniform distributions of temperature and mole fractions of chemical species in the radial direction. For instance, due to the diffusion of the unburned fuel into surroundings, temperature-uniform area was reduced at sub-atmospheric pressures, and the laminar burning velocities dropped down [9]. In addition, the material of the burner plug plays an important role in affecting the flame flatness. For rich premixed flame produced by the McKenna burner with a stainless steel plug, the flame is not as flat as that with a bronze plug, which is mainly caused by the difference of thermal conductibility for two cases [10]. Therefore, to examine the performance of the Abstract Flame flatness is one of the most critical factors in evaluating the performance of a flat-flame burner. In this paper, the flame flatness of a flat-flame burner is validated using a resolution-doubled one-dimensional wavelength modulation spectroscopy tomography (1D-WMST) technique that only uses one view of multiple parallel laser beams. When the interval of two neighboring parallel laser beams is Δr, a designed novel geometry of the parallel laser beams realizes a doubled tomographic resolution of Δr/2. Using the proposed technique, the distributions of temperature and H 2 O mole fraction in an axisymmetric premixed flame are simultaneously reconstructed and hence the flame flatness of a flat-flame burner can be validated. The flatness factor is quantitatively described by the similarity between the reconstructed and expected distributions of H 2 O mole fraction. For flat and non-flat flames, the experimental results agree well with the CFD simulation results, denoting that the resolution-doubled 1D-WMST technique provides...

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Three-dimensional reconstruction of flame temperature and emissivity distribution using optical tomographic and two-colour pyrometric techniques

Cited by 105 publications

References 33 publications

Geometric calibration of focused light field camera for 3-D flame temperature measurement

Geometric calibration of focused light field camera for 3-D flame temperature measurement

OxyCAP UK: Oxyfuel Combustion - academic Programme for the UK

Resolution-doubled one-dimensional wavelength modulation spectroscopy tomography for flame flatness validation of a flat-flame burner

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