A WMS Based TDLAS Tomographic System for Distribution Retrievals of Both Gas Concentration and Temperature in Dynamic Flames

Zhao, Wenshuai; Xu, Lijun; Huang, Ang; Gao, Xin; Luo, Xizi; Zhang, Hongyu; Chang, Haitao; Cao, Zhang

doi:10.1109/jsen.2019.2962736

Cited by 48 publications

(19 citation statements)

References 32 publications

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“…To explain the effect of gas temperature on the full width at half-maximum (FWHM), the Gaussian function was chosen as the lineshape function in this paper. It can be expressed as follows [23]:…”

Section: Methodsmentioning

confidence: 99%

A Method for Correcting the Interference of Overlapping Absorption Lines Using Second Harmonic Spectral Reconstruction

Yue

Huang

2021

Applied Sciences

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The measurement accuracy of trace gas detection based on infrared absorption spectroscopy is influenced by the overlap of absorption lines. A method for correcting the interference of overlapping absorption lines using second harmonic spectral reconstruction (2f-SR) is proposed to improve the measurement accuracy. 2f-SR includes three parts: measurement of gas temperature and use of the differences in temperature characteristics of absorption lines to correct the temperature error, 2f signal restoration based on laser characteristics to eliminate the influence of waveform change on overlapping absorption lines, and fast multi-peak fitting for the separation of interference from overlapping absorption lines. The CH4 measurement accuracy based on overlapping absorption lines is better than 0.8% using 2f-SR. 2f-SR has a lower minimum detection limit (MDL) and a higher detection accuracy than the separation of overlapping absorption lines based on the direct absorption method. The MDL is reduced by two to three orders of magnitude and reaches the part per million by volume level. 2f-SR has clear advantages for correcting the interference of overlapping absorption lines in terms of both MDL and measurement accuracy.

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Section: Methodsmentioning

confidence: 99%

A Method for Correcting the Interference of Overlapping Absorption Lines Using Second Harmonic Spectral Reconstruction

Yue

Huang

2021

Applied Sciences

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“…, vv = A La (3) where ∈ ℝ ×1 denotes the vector of path integrals obtained from M LOS-TDLAS measurements.…”

Section: Since the Line-shape Function Can Be Normalized Asmentioning

confidence: 99%

“…Since the first experimental demonstration of high-speed chemical species tomography [1], interest in Tunable Diode Laser Absorption Spectroscopy (TDLAS) tomography has grown rapidly, with a focus on non-invasive imaging of critical combustion parameters, e.g. temperature [2][3][4][5], gas concentration [3][4][5][6][7], pressure [8,9] and velocity [10], in reactive flows. High-fidelity temperature imaging is of critical interest, as the temperature distribution directly relates to heat transfer and reveals combustion efficiency and temperature-dependent creation of pollutants, such as NOx and CO.…”

Section: Introductionmentioning

confidence: 99%

“…To mitigate the instability of the reconstructions, a variety of computational tomographic algorithms have been applied in TDLAS tomography, e.g. Algebraic Reconstruction Technique (ART) [15], Simultaneous Algebraic Reconstruction Technique (SART) [3,16], Landweber algorithm [4,17], and Tikhonov regularisation [18], by formulating the inverse problem with a heuristically determined prior, e.g. smoothness of the true temperature distributions.…”

Section: Introductionmentioning

confidence: 99%

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Relative Entropy Regularized TDLAS Tomography for Robust Temperature Imaging

Bao

Zhang

Enemali

et al. 2021

IEEE Trans. Instrum. Meas.

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Tunable Diode Laser Absorption Spectroscopy (TDLAS) tomography has been widely used for in situ combustion diagnostics, yielding images of both species concentration and temperature. The temperature image is generally obtained from the reconstructed absorbance distributions for two spectral transitions, i.e. two-line thermometry. However, the inherently ill-posed nature of tomographic data inversion leads to noise in each of the reconstructed absorbance distributions. These noise effects propagate into the absorbance ratio and generate artefacts in the retrieved temperature image. To address this problem, we have developed a novel algorithm, which we call Relative Entropy Tomographic RecOnstruction (RETRO), for TDLAS tomography. A relative entropy regularisation is introduced for high-fidelity temperature image retrieval from jointly reconstructed two-line absorbance distributions. We have carried out numerical simulations and proof-of-concept experiments to validate the proposed algorithm. Compared with the wellestablished Simultaneous Algebraic Reconstruction Technique (SART), the RETRO algorithm significantly improves the quality of the tomographic temperature images, exhibiting excellent robustness against TDLAS tomographic measurement noise. RETRO offers great potential for industrial field applications of TDLAS tomography, where it is common for measurements to be performed in very harsh environments.

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“…Infrared absorption spectroscopy is widely researched due to numerous advantages including fast response, nonintrusive nature, and sensitive species-specific detection capabilities [1][2][3][4], compared with traditional gas-sensing techniques such as catalyst combustion [5][6][7], electrochemical [8][9][10], and semiconductor [11][12][13]. erefore, gas-sensing systems and sensors based on infrared absorption spectroscopy have been reported by many research groups in recent years, and many related techniques have been developed and improved to achieve high-sensitive sensing ability [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Research on Spectroscopy Modulation of a Distributed Feedback Laser Diode Based on the TDLAS Technique

Xue

et al. 2021

International Journal of Optics

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Laser current and temperature control circuits have been developed for a distributed feedback laser diode, which is applied as the light source of a tuneable diode laser absorption spectroscopy system. The laser’s temperature fluctuation can be limited within the range of −0.02 to 0.02°C, and good operation stability was observed through 15 hours of monitoring on the emitting wavelength of the laser. Response time of temperature modulation was tested which is suitable for the tuning requirements of gas detection systems. Laser current can be injected within the range from 40 to 80 mA. In addition, a linear power supply circuit has been developed to provide stable and low-noise power supply for the system. The physical principles of laser modulation theory are discussed before experiments. Experiments show that the output wavelength of the laser can be tuned accurately through changing the working current and temperature. The wavelength can be linearly controlled by temperature at 0.115 nm/°C (I = 70 mA) and be controlled by current at 0.0140 nm/mA (T = 25°C). This is essential for the tuneable diode laser absorption spectroscopy systems. The proposed cost-effective circuits can replace commercial instruments to drive the laser to meet the requirements of methane detection experiments. It can also be applied to detect other gases by changing the light source lasers and parameters of the circuits.

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A WMS Based TDLAS Tomographic System for Distribution Retrievals of Both Gas Concentration and Temperature in Dynamic Flames

Cited by 48 publications

References 32 publications

A Method for Correcting the Interference of Overlapping Absorption Lines Using Second Harmonic Spectral Reconstruction

A Method for Correcting the Interference of Overlapping Absorption Lines Using Second Harmonic Spectral Reconstruction

Relative Entropy Regularized TDLAS Tomography for Robust Temperature Imaging

Research on Spectroscopy Modulation of a Distributed Feedback Laser Diode Based on the TDLAS Technique

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