Pulverized coal combustion application of laser-based temperature sensing system using computed tomography – Tunable diode laser absorption spectroscopy (CT-TDLAS)

Wang, Zhenzhen; Deguchi, Yoshihiro; Kamimoto, Takahiro; Tainaka, Kazuki; Tanno, Kenji

doi:10.1016/j.fuel.2020.117370

Cited by 40 publications

(17 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, for some remote applications, such as underground fire detection [217], it is necessary to measure the temperature at the same time together with the concentration of the target gases in order to determine the combustion location [218,219]. Currently, computer tomography (CT)-TDLAS has been developed and widely used to simultaneously measure 2D temperature and concentration [220][221][222][223][224][225][226]. However, measurement of gas pressure distribution still needs to be developed for remote sensing applications.…”

Section: Challengesmentioning

confidence: 99%

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

Remote chemical detection in the atmosphere or some specific space has always been of great interest in many applications for environmental protection and safety. Laser absorption spectroscopy (LAS) is a highly desirable technology, benefiting from high measurement sensitivity, improved spectral selectivity or resolution, fast response and capability of good spatial resolution, multi-species and standoff detection with a non-cooperative target. Numerous LAS-based standoff detection techniques have seen rapid development recently and are reviewed herein, including differential absorption LiDAR, tunable laser absorption spectroscopy, laser photoacoustic spectroscopy, dual comb spectroscopy, laser heterodyne radiometry and active coherent laser absorption spectroscopy. An update of the current status of these various methods is presented, covering their principles, system compositions, features, developments and applications for standoff chemical detection over the last decade. In addition, a performance comparison together with the challenges and opportunities analysis is presented that describes the broad LAS-based techniques within the framework of remote sensing research and their directions of development for meeting potential practical use.

show abstract

Section: Challengesmentioning

confidence: 99%

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

et al. 2020

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…For MVN posterior distributions the MAP is equal to the mean value of the distribution, post = MAP , given in Equation (11). The MAP can also be defined as the solution to a least squares minimization problem [20] MAP = arg min…”

Section: Maximum a Posteriori And Tikhonov Regularizationmentioning

confidence: 99%

“…The calculation of ( ) is analogous to the first step in determining the resolution matrix given in Equation ( 15), but instead of a fixed set of point sources we propagate the statistics of the prior and the measurement error. Accordingly the second step is the propagation of the measurement PDF to the PDF for MAP based on Equation (11), which gives…”

Section: Resolution Of the Map Estimatementioning

confidence: 99%

“…Over the last decades absorption spectroscopic linear hard field tomography of gas phase media has been applied to a multitude of engineering problems, including turbines [2,3,4,5], piston engines [6,7,8], exhaust gas aftertreatment [9,10], and coal combustion [11] to reconstruct the spatial distribution of temperatures or concentrations. The tomographic reconstruction of these distributions from several line integrals is generally an inverse problem.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantifying the spatial resolution of the maximum a posteriori estimate in linear, rank-deficient, Bayesian hard field tomography

Emmert,

Wagner,

Daun

2020

Preprint

View full text Add to dashboard Cite

Image based diagnostics are interpreted in the context of spatial resolution. The same is true for tomographic image reconstruction. Current empirically driven approaches to quantify spatial resolution [1] rely on a deterministic formulation based on point-spread functions which neglect the statistical prior information, that is integral to rank-deficient tomography. We propose a statistical spatial resolution measure based on the covariance of the reconstruction (point estimate) and show that the prior information acts as a lower limit for the spatial resolution. Furthermore, the spatial resolution measure can be employed for designing tomographic systems under consideration of spatial inhomogeneity of spatial resolution.

show abstract

“…With the development of laser technology, trace gas detection methods based on absorption spectroscopy have been continuously developed and improved. Among the absorption spectroscopy gas detection techniques, tunable diode laser absorption spectroscopy (TDLAS) − and photoacoustic spectroscopy (PAS) − have attracted extensive attention since they offer ultra-high gas selectivity and sensitivity together with fast response. When the sample gas is irradiated with a laser whose wavelength overlaps the absorption line of the target gas, part of the laser energy will be absorbed.…”

mentioning

confidence: 99%

High-Sensitivity Silicon Cantilever-Enhanced Photoacoustic Spectroscopy Analyzer with Low Gas Consumption

Guo

Chen

et al. 2022

Anal. Chem.

View full text Add to dashboard Cite

A silicon cantilever-enhanced photoacoustic spectroscopy (PAS)based trace gas analyzer with low gas consumption is presented. A silicon cantilever-based fiber-optic Fabry−Perot (F−P) interferometric acoustic sensor with a compact structure and high sensitivity is designed for photoacoustic signal detection. The non-resonant photoacoustic cell (PAC) is a cylindrical copper tube with a volume of 0.56 mL. A near-infrared laser with a center wavelength of 1532.83 nm amplified using an erbium-doped fiber application amplifier is used as the excitation light. The wavelength modulation spectroscopy (WMS) technique is employed in the present work for second-harmonic photoacoustic signal detection. The experimental results show that the minimum detection limit of C 2 H 2 is 199.8 parts per trillion (ppt) with an average time of 60 s. The normalized noise equivalent absorption coefficient is calculated as 1.72 × 10 −9 cm −1 W/Hz 1/2 . Furthermore, the proposed silicon cantilever-enhanced non-resonant PAS-based gas analyzer can not only analyze the gas concentration in a closed small-capacity PAC with low gas consumption but also detect target gas leakage in real time at a long distance.

show abstract

Pulverized coal combustion application of laser-based temperature sensing system using computed tomography – Tunable diode laser absorption spectroscopy (CT-TDLAS)

Cited by 40 publications

References 26 publications

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

Standoff Chemical Detection Using Laser Absorption Spectroscopy: A Review

Quantifying the spatial resolution of the maximum a posteriori estimate in linear, rank-deficient, Bayesian hard field tomography

High-Sensitivity Silicon Cantilever-Enhanced Photoacoustic Spectroscopy Analyzer with Low Gas Consumption

Contact Info

Product

Resources

About