Towards a two-dimensional concentration and temperature laser absorption tomography sensor system

Kasyutich, Vasili L.; Martin, Philip A.

doi:10.1007/s00340-010-4123-6

Cited by 62 publications

(30 citation statements)

References 33 publications

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“…When the flame is stabilized, the 2D distributions of temperature T cal and H 2 O mole fraction C cal are obtained. In order to smooth the reconstructed image, the cubic spline interpolating function is applied to the final image data process [31]. In the core of the flame, the value of T cal and C cal are larger than beside value in case of a higher equivalent ratio.…”

Section: Experiments Process and Analysismentioning

confidence: 99%

A Study of Two Dimensional Tomography Reconstruction of Temperature and Gas Concentration in a Combustion Field Using TDLAS

Sun

Zhang

et al. 2017

Applied Sciences

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Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas concentration and temperature are realized using an algebraic reconstruction technique (ART). The influence of the beam distribution and grid size on combustion field reconstruction is investigated to attain optimal reconstruction results with a limited number of beams. Under limited optical-path numbers, it shows that a better spatial resolution is attainable only when the laser beam paths are vertical and parallel to the symmetry axis of the combustion field. Furthermore, experiments with 16 beam paths using one and two flat flame combustion fields are carried out in different fuel-air equivalence ratios under room temperature. The results are in agreement with the simulation results, and the time resolution is less than 1 s.

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Section: Experiments Process and Analysismentioning

confidence: 99%

A Study of Two Dimensional Tomography Reconstruction of Temperature and Gas Concentration in a Combustion Field Using TDLAS

Sun

Zhang

et al. 2017

Applied Sciences

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“…This has been described previously in several papers [24]. When the temperature is determined then the line strength S(T) can be calculated from (7) and the number density N or concentration by the rearrangement of (6).…”

Section: Two-line Thermometrymentioning

confidence: 99%

“…The paper first describes the background theory of twoline thermometry building our previous work [24] followed by a description of the tomographic reconstruction algorithm used. The experimental setup of the tomography system and reconstruction methodology is described in Sect.…”

Section: Introductionmentioning

confidence: 99%

Tomographic imaging of reacting flows in 3D by laser absorption spectroscopy

Foo

Martin

2017

Appl. Phys. B

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absorbances at each angle form the sinogram from which the 2D image of integrated absorbance of each line can be reconstructed by the direct Fourier reconstruction based on the Fourier slice theorem. The ratio of the integrated absorbances of the two lines can then be related to temperature alone in a method termed, two-line thermometry. The 2D temperature distribution obtained was validated for pattern and accuracy by thermocouple measurements. With the reconstructed temperature distribution, the temperaturedependent line strengths could be determined and subsequently the concentration distribution of water across the 2D plane whilst variations in burner condition were carried out. These results show that the measurement system based on TDLAS can be used for 2D temporal or 3D volume imaging of temperature and chemical species concentration in reacting flows.

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“…Kasyutich and Martin (2011) have developed a tunable laser absorption spectrometer with minimal amount of equipment and at the same time relatively high spatial resolution. Although there is only one measurement channel, multiple beams can be evaluated consecutively.…”

Section: A Seidel Et Al: Robust Spatially Scanning Open-path Tdlamentioning

confidence: 99%

Robust, spatially scanning, open-path TDLAS hygrometer using retro-reflective foils for fast tomographic 2-D water vapor concentration field measurements

et al. 2015

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Abstract.We have developed a fast, spatially scanning direct tunable diode laser absorption spectrometer (dTDLAS) that combines four polygon-mirror based scanning units with low-cost retro-reflective foils. With this instrument, tomographic measurements of absolute 2-D water vapor concentration profiles are possible without any calibration using a reference gas.A spatial area of 0.8 m × 0.8 m was covered, which allows for application in soil physics, where greenhouse gas emission from certain soil structures shall be monitored. The whole concentration field was measured with up to 2.5 Hz. In this paper, we present the setup and spectroscopic performance of the instrument regarding the influence of the polygon rotation speed and mode on the absorption signal. Homogeneous H 2 O distributions were measured and compared to a single channel, bi-static reference TDLAS spectrometer for validation of the instrument. Good accuracy and precision with errors of less than 6 % of the absolute concentration and length and bandwidth normalized detection limits of up to 1.1 ppmv · m (Hz) −0.5 were achieved.The spectrometer is a robust and easy to set up instrument for tomographic reconstructions of 2-D-concentration fields that can be considered as a good basis for future field measurements in environmental research.

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Towards a two-dimensional concentration and temperature laser absorption tomography sensor system

Cited by 62 publications

References 33 publications

A Study of Two Dimensional Tomography Reconstruction of Temperature and Gas Concentration in a Combustion Field Using TDLAS

A Study of Two Dimensional Tomography Reconstruction of Temperature and Gas Concentration in a Combustion Field Using TDLAS

Tomographic imaging of reacting flows in 3D by laser absorption spectroscopy

Robust, spatially scanning, open-path TDLAS hygrometer using retro-reflective foils for fast tomographic 2-D water vapor concentration field measurements

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