Gas visualization of industrial hydrocarbon emissions

Sandsten, Jonas; Edner, Hans; Svanberg, Sune

doi:10.1364/opex.12.001443

Cited by 32 publications

(19 citation statements)

References 8 publications

(11 reference statements)

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“…Finally, correlation spectroscopy has found application in gas imaging through the work of Sandsten et al [143] . An image (for example of a petrochemical plant) is split through two arms of a gas correlation telescope, one of which contains a reference gas cell.…”

Section: Correlation Spectroscopymentioning

confidence: 99%

Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,307

858

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The detection and measurement of gas concentrations using the characteristic optical absorption of the gas species is important for both understanding and monitoring a variety of phenomena from industrial processes to environmental change. This article reviews the field, covering several individual gas detection techniques including non-dispersive infrared (NDIR), spectrophotometry, tunable diode laser spectroscopy and photoacoustic spectroscopy. We present the basis for each technique, recent developments in methods and performance limitations. The technology available to support this field, in terms of key components such as light sources and gas cells, has advanced rapidly in recent years and we discuss these new developments. Finally, we present a performance comparison of different techniques, taking data reported over the preceding decade, and draw conclusions from this benchmarking.

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Section: Correlation Spectroscopymentioning

confidence: 99%

Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,307

858

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“…hotodetectors with multi-color function, capable of near room temperature operation are highly in demand for delivering the next generation of mid-infrared (mid-IR) imaging sensors [1]. Apart from the well-known applications in military, defense and security, these novel detectors will create opportunities in a number of civilian applications such as gas detection and biomedical diagnosis by significantly reducing the cost and size of the imaging systems [2,3]. Mid-IR photodetectors based on HgCdTe (also known as MCT) have shown unbeaten detection performance owing to the long minority carrier lifetime [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Monolithically Integrated InAsSb-Based nBnBn Heterostructure on GaAs for Infrared Detection

Xie

Pusino

Khalid

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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High operating temperature infrared photodetectors with multi-color function that are capable of monolithic integration are of increasing importance in developing the next generation of mid-IR image sensors. Applications of these sensors include defense, medical diagnosis, environmental and astronomical observations. We have investigated a novel InAsSb-based nBnBn heterostructure that combines a state-of-art InAsSb nBn detector with an InAsSb/GaSb heterojunction detector. At room temperature, reduction in the dark current density of more than an order of magnitude was achieved compared to previously investigated InAsSb/GaSb heterojunction detectors.Electrical characterization from cryogenic temperatures to room temperature confirmed that the nBnBn device was diffusion limited for temperatures above 150K. Optical measurements demonstrated that the nBnBn detector was sensitive in both the SWIR and MWIR wavelength range at room temperature. The specific detectivity (D*) of the competed nBnBn devices was calculated to be 8.6×10 8 cm·Hz 1/2 W -1 at 300K and approximately 1.0×10 10 cm·Hz 1/2 W -1 when cooled down to 200K (with 0.3V reverse bias and 1550nm illumination). In addition, all photodetector layers were grown monolithically on GaAs active layers using the interfacial misfit array growth mode. Our results therefore pave the way for the development of new active pixel designs for monolithically integrated mid-IR imaging arrays.

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“…Infrared gas imaging analyzes the radiance changes in a scene to look for absorption or emission signatures generated by gases passing between the camera and the background. [14][15][16][17] Gases that are cooler than the background are seen in absorption, while gases warmer than the background (e.g., when passing in front of a cold blue sky) are seen in emission.…”

Section: Infrared Gas Imagingmentioning

confidence: 99%

Sensitivity limits on optical gas imaging due to air turbulence

Hagen

2018

Opt. Eng.

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Infrared cameras are widely used for the detection of fugitive gas leaks and for quantifying gas emissions. While the gas detection sensitivity in the presence of noise is now well understood, we show that windturbulence-induced thermal fluctuations place a fundamental lower limit on gas detection sensitivity. While for many gases the lower limit is too low to be important, we show that for some gases it places a real limitation on measurements when the background is a near-ground surface.

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Gas visualization of industrial hydrocarbon emissions

Cited by 32 publications

References 8 publications

Optical gas sensing: a review

Optical gas sensing: a review

Monolithically Integrated InAsSb-Based nBnBn Heterostructure on GaAs for Infrared Detection

Sensitivity limits on optical gas imaging due to air turbulence

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