Gas analysis in the UV region: a hollow-core waveguide sensor system

Eckhardt, Hanns Simon; Dominick, H.; Frank, Matthias; Grattan, Kenneth T. V.; Klein, Karl-Friedrich

doi:10.1117/12.566549

Cited by 3 publications

(2 citation statements)

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“…Limits of detection were 16 ppb for CO 2 at 4.2 μm and 520 ppb for CH 4 at 7.7 μm. The feasibility of using the same design of waveguide for spectral measurements in the UV (180-205 nm) has also been reported [65] . 20 into a 700 μm core diameter capillary of this type, for the purpose of detecting ethyl chloride [66] .…”

Section: Performance Limitationsmentioning

confidence: 93%

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Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,319

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: Performance Limitationsmentioning

confidence: 93%

Section: Performance Limitations Kim Et Al Have Used a Hcwgmentioning

confidence: 93%

Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,319

858

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Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Khan

Newport

Calvé

2019

Sensors

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Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO2, SO2, and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging.

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Design theory, materials selection, and fabrication of hollow core waveguides for infrared to THz radiation

Bowden¹

2007

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Gas analysis in the UV region: a hollow-core waveguide sensor system

Cited by 3 publications

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Optical gas sensing: a review

Optical gas sensing: a review

Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Design theory, materials selection, and fabrication of hollow core waveguides for infrared to THz radiation

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