Concentration and Temperature Tomography at Elevated Pressures

Wood, Michael P.; Ozanyan, Krikor B.

doi:10.1109/jsen.2013.2260535

Cited by 8 publications

(9 citation statements)

References 32 publications

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“…Obvious candidates are Photonic Guided-path Tomography (PGPT) [17] and Hard-Field THz Tomography [18], where CoM information can be the ultimate target for e.g. smart carpets [17] or temperature distribution tracking [19]. However, it should be noted that the full potential of PCoMA can be achieved only with tomography sensors allowing true parallel data acquisition from a large number of measurement channels [10], possibly integrated on the same FPGA chip.…”

Section: Discussionmentioning

confidence: 99%

Parallel-Data Reconstruction for Limited Views Tomography Sensors by Sinusoidal Hough Transform

Cantoral-Ceballos

Ozanyan

2013

IEEE Sensors J.

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Physical limitations found in industrial environments often restrain imaging for process tomography. When information is collected from sparse sensors, the acquired data is limited in terms of radial and angular sampling of the imaged slice. To overcome this problem, we demonstrate an efficient solution based on the parallel implementation of the sinogram recovery algorithm (SRA) for limited views in its variant based on the calculation of the coordinates of the center of mass (CoMs) of the subject under test, rather than performing the complete sinogram restoration. By introducing a modification in the existing SRA, we achieve high parallelization of each stage, making it ideal for implementation in hardware accelerated systems, such as field programmable gate arrays. The potential to parallelize the SRA is first studied in MATLAB, by processing all data projections concurrently and verifying performance by matching the results from the parallel and sequential implementations. Furthermore, the algorithm is coded in very high speed integrated circuits hardware description language, which is implemented and tested on a Xilinx Virtex 6 board. We report speedups of between three and four orders of magnitude, whereas the errors in CoMs' coordinates are reduced.Index Terms-Field programmable gate array (FPGA), Hough transform, parallel algorithm, sinogram recovery, tomography, very high speed integrated circuits hardware description language (VHDL).

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Section: Discussionmentioning

confidence: 99%

Parallel-Data Reconstruction for Limited Views Tomography Sensors by Sinusoidal Hough Transform

Cantoral-Ceballos

Ozanyan

2013

IEEE Sensors J.

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“…parallel (58,144,161,163,167) and fan-shaped (150,164,168,169) beam arrangements, the measurement space should be sampled evenly in spatial and angular dimensions to achieve the best image reconstruction results. Subject to the limits imposed by the physical size of the collimators and detectors, regular beam arrangements are often impractical in particular applications such as a multi-cylinder engine and a gas turbine engine (31,170).…”

Section: Beam Optimizationmentioning

confidence: 99%

“…Combined with additional optical elements, different optical access strategies can be created based on the deflected laser beam. The solutions for rank-deficient problems, such as the first-order Tikhonov regularization and modified Landweber algorithm, give rise to many linear LAS tomography measurements with limited number of laser beams (30,161,(163)(164)(165)(166)169). Compared with the beam scanning manners, the stationary tomographic sensor not only enhances the temporal resolution, but also greatly reduces the uncertainty introduced by the beam movements and greatly improves the reliability.…”

Section: Design Of Tomographic Sensors and Systemsmentioning

confidence: 99%

Laser absorption spectroscopy for combustion diagnosis in reactive flows: A review

Liu

2018

Applied Spectroscopy Reviews

174

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Laser absorption spectroscopy (LAS) has been rapidly developed and widely applied to combustion diagnosis in recent decades. As a costeffective tool for measuring multiple combustion parameters, LAS provides unique properties in terms of accuracy and sensitivity for understanding the reactions and kinetics in reactive flows. Line-ofsight and tomographic LAS techniques have stimulated numerous applications and been proved to be robust for in situ combustion diagnosis in uniform and non-uniform combustion fields, respectively. This review highlights the breakthroughs in the evolution of LAS techniques from the viewpoints of key principles, sensors and instrumentations developed for combustion diagnosis, with particular emphasis on a series of spatially-resolved LAS techniques with their recent applications on obtaining high-fidelity measurement results with minimal intrusion to the practical combustors. Along the way, we note some challenges and requirements for further development of the LAS-based combustion diagnosis.

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“…[7][8][9][10][11][12][13] For instance, Wondraczek et al built a laser-tomographic imaging system and acquired the distribution of carbon monoxide in a laminar flame by making multiple laser beams penetrate a rotating burner. 13 Wang et al designed a laboratorial TDLAS-based tomography system and reconstructed 2D distributions of NH 3 mole fraction by simultaneously rotating four laser beams on the rotating platforms.…”

Section: Introductionmentioning

confidence: 99%

Tunable diode laser absorption spectroscopy-based tomography system for on-line monitoring of two-dimensional distributions of temperature and H2O mole fraction

Liu

Jing

et al. 2016

Review of Scientific Instruments

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Articles you may be interested inVapor phase tri-methyl-indium seeding system suitable for high temperature spectroscopy and thermometry Rev. Sci. Instrum. 86, 093107 (2015) To monitor two-dimensional (2D) distributions of temperature and H 2 O mole fraction, an on-line tomography system based on tunable diode laser absorption spectroscopy (TDLAS) was developed.To the best of the authors' knowledge, this is the first report on a multi-view TDLAS-based system for simultaneous tomographic visualization of temperature and H 2 O mole fraction in real time. The system consists of two distributed feedback (DFB) laser diodes, a tomographic sensor, electronic circuits, and a computer. The central frequencies of the two DFB laser diodes are at 7444.36 cm −1 (1343.3 nm) and 7185.6 cm −1 (1391.67 nm), respectively. The tomographic sensor is used to generate fan-beam illumination from five views and to produce 60 ray measurements. The electronic circuits not only provide stable temperature and precise current controlling signals for the laser diodes but also can accurately sample the transmitted laser intensities and extract integrated absorbances in real time. Finally, the integrated absorbances are transferred to the computer, in which the 2D distributions of temperature and H 2 O mole fraction are reconstructed by using a modified Landweber algorithm. In the experiments, the TDLAS-based tomography system was validated by using asymmetric premixed flames with fixed and time-varying equivalent ratios, respectively. The results demonstrate that the system is able to reconstruct the profiles of the 2D distributions of temperature and H 2 O mole fraction of the flame and effectively capture the dynamics of the combustion process, which exhibits good potential for flame monitoring and on-line combustion diagnosis. C 2016 AIP Publishing LLC. [http://dx

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Concentration and Temperature Tomography at Elevated Pressures

Cited by 8 publications

References 32 publications

Parallel-Data Reconstruction for Limited Views Tomography Sensors by Sinusoidal Hough Transform

Parallel-Data Reconstruction for Limited Views Tomography Sensors by Sinusoidal Hough Transform

Laser absorption spectroscopy for combustion diagnosis in reactive flows: A review

Tunable diode laser absorption spectroscopy-based tomography system for on-line monitoring of two-dimensional distributions of temperature and H2O mole fraction

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