Gas imaging by infrared gas-correlation spectrometry

Sandsten, Jonas; Edner, Hans; Svanberg, Sune

doi:10.1364/ol.21.001945

Cited by 41 publications

(9 citation statements)

References 10 publications

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“…COSPEC is immune to fluctuations of the light source and the disturbance of other gases. Two typical COSPEC methods, namely, gas filter correlation (GFC) [7,8] and interferometric correlation (INC) [7], have been proposed. Both methods used differential measurements to reject various kinds of interference.…”

Section: Introductionmentioning

confidence: 99%

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Wang¹,

Somesfalean²,

Mei³

et al. 2011

PIER

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Abstract-A correlation spectroscopy (COSPEC) based on a multiwavelength fiber laser is first proposed for the detection of gas concentration. The lasing wavelengths are selected to match several characteristic absorption peaks of the gas under test, and the gas concentration is easily measured by correlating it with the reference gas. The present method is immune from the instability of the light source and the influence of other gases. The concentration measurement of C 2 H 2 is demonstrated in the experiment in its nearinfrared dominant absorption region. The technique has prospects for simultaneous detection of multiple gases, and the measurement of mixed gases of C 2 H 2 and CO 2 is also analyzed.

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Section: Introductionmentioning

confidence: 99%

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Wang¹,

Somesfalean²,

Mei³

et al. 2011

PIER

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“…A four filter IR camera was actually used by Lopez et al [86] to simultaneously determine plume the SO 2 SCD, temperature, and ash content of the plume of Stromboli (Italy), Karymsky (Russia), and Láscar (Chile) volcanoes. (2) Gas-correlation spectroscopy has also been applied in the IR for real time imaging of ammonia and ethylene (e.g., [87,88]).…”

Section: Non-dispersive Ir Imaging Of Plumesmentioning

confidence: 99%

Ground-Based Remote Sensing and Imaging of Volcanic Gases and Quantitative Determination of Multi-Species Emission Fluxes

2018

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The physical and chemical structure and the spatial evolution of volcanic plumes are of great interest since they influence the Earth's atmospheric composition and the climate. Equally important is the monitoring of the abundance and emission patterns of volcanic gases, which gives insight into processes in the Earth's interior that are difficult to access otherwise. Here, we review spectroscopic approaches (from ultraviolet to thermal infra-red) to determine multi-species emissions and to quantify gas fluxes. Particular attention is given to the emerging field of plume imaging and quantitative image interpretation. Here UV SO 2 cameras paved the way but several other promising techniques are under study and development. We also give a brief summary of a series of initial applications of fast imaging techniques for volcanological research.

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“…35 In addition, gas correlation spectroscopy measurements (e.g. Ward and Zwick, 1975;Sandsten et al, 1996Sandsten et al, , 2004Kebabian et al, 2000) require absorption cells containing the gas to be measured at CDs leading to optical densities around unity. In general, there are a number of issues with using gas cells for these purposes including:  Stability of the gas in the cell due to photolysis and/or chemical reactions 40…”

Section: Introduction 30mentioning

confidence: 99%

Caution with Spectroscopic NO<sub>2</sub> Reference Cells (Cuvettes)

Platt¹,

Kuhn²

2019

Preprint

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Spectroscopic measurements of atmospheric trace gases, e.g. by Differential Optical Absorption Spectroscopy (DOAS) are frequently supported by recording the trace gas column density (CD) in absorption cells (cuvettes), which are temporarily inserted into the light-path. The idea is to verify the proper working of the instruments, to check the spectral registration 15(wavelength calibration and spectral resolution), and to perform some kind of calibration (absolute determination of trace gas CDs). In principle DOAS applications do not require absorption cell calibration, however in practice measurements with absorption cells in the spectrometer's light path are frequently performed. In addition, trace gas absorption cells are used as a central component in gas correlation spectroscopy instruments. 20Here we show at the example of NO 2 absorption cells that the effective CD seen by the instrument can deviate greatly from expected values (by orders of magnitude). Analytical calculations and kinetic model studies show the dominating influence of photolysis and dimerisation of NO 2 . In particular, this means that the partial pressure of NO 2 in the cell matters. However, problems can be particular severe at high NO 2 pressures (around 10 5 Pa) as well as 25 low NO 2 partial pressures (of the order of a few 100 Pa). Also, it can be of importance whether the cell contains pure NO 2 or is topped up with air or oxygen (O 2 ). Some suggestions to improve the situation are discussed.Atmos. Meas. Tech. Discuss., https://doi.

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Gas imaging by infrared gas-correlation spectrometry

Cited by 41 publications

References 10 publications

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Ground-Based Remote Sensing and Imaging of Volcanic Gases and Quantitative Determination of Multi-Species Emission Fluxes

Caution with Spectroscopic NO<sub>2</sub> Reference Cells (Cuvettes)

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Gas imaging by infrared gas-correlation spectrometry

Cited by 41 publications

References 10 publications

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Ground-Based Remote Sensing and Imaging of Volcanic Gases and Quantitative Determination of Multi-Species Emission Fluxes

Caution with Spectroscopic NO&lt;sub&gt;2&lt;/sub&gt; Reference Cells (Cuvettes)

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Caution with Spectroscopic NO<sub>2</sub> Reference Cells (Cuvettes)