Fiber-optic based gas sensing in the UV region

Eckhardt, H. S.; Graubner, Konrad; Klein, K.-F.; Sun, Tao; Grattan, K. T. V.

doi:10.1117/12.647753

Cited by 5 publications

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“…in UV range compared to IR. The system was then tested to measure the absorbance of ammonia and nitric oxide of 1.1 ppm in the wavelength range of 185 to 205 nm [108,109,110]. The system sensitivity and selectivity were enhanced by coupling the prototype with GC (length 25 m, diameter 0.32 mm) as given in Figure 27a [108].…”

Section: Applications Of Deep-uv Absorption Spectrophotometrymentioning

confidence: 99%

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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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Section: Applications Of Deep-uv Absorption Spectrophotometrymentioning

confidence: 99%

“…( a ) Schematic of the experimental setup with Gas Chromatography. ( b ) Chromatograph obtained for different molecules (red line represents a magnified version (8 times) of the chromatogram) [108,109,110]. …”

Section: Figurementioning

confidence: 99%

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

Khan

Newport

Calvé

2019

Sensors

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“…Previous research on BTEX detection was primarily focussed on the sensitivity of the sensor and mostly an individual BTEX molecule was tested. Eckhardt et al [21,22] developed a detector with an aluminium-coated HCW (length, 1 m and diameter, 1 mm) as a gas cell, deuterium lamp (30 W) as UV source, and CCD-based spectrometer as a UV detector. The setup was coupled with GC and tested for detection of aromatics compounds like ethylbenzene and bromobenzene.…”

Section: Introductionmentioning

confidence: 99%

A Sensitive and Portable Deep-UV Absorbance Detector with a Microliter Gas Cell Compatible with Micro GC

2021

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Deep-UV absorption spectrometry for detection of toxic airborne gases, for instance, Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) has drawn considerable attention owing to its high sensitivity and reliability. However, the development of a deep-UV absorbance detector having good sensitivity, portability, and a low-volume gas cell with applicability for a micro Gas Chromatography (μGC) is challenging. Herein we present a novel, self-referenced, and portable deep-UV absorbance detector with a microliter (275 μL) gas cell having minimal dead volume. It has excellent compatibility with μGC for detection of individual BTEX components in a mixed sample at a sub-ppm level. The design consists of the latest, portable, and cost-effective optical and electronic components, i.e., deep-UV LED, hollow-core waveguide, and photodiodes. The detector directly measures the absorbance values in volts using an integrated circuit with a log-ratio amplifier. The prototype was tested with direct injection of toluene-N2 (1.5 ppm to 50 ppm) and good linearity (R2 = 0.99) with a limit of detection of 196 ppb was obtained. The absorbance detector with μGC setup was tested with a BTEX mixture in N2 at different GC column temperatures. All the BTEX species were sequentially separated and detected with an individual peak for a concentration range of 2.5 ppm to 10 ppm.

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Optical Fibers for Biomedical Applications

Ben‐David

Gannot

2007

Specialty Optical Fibers Handbook

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Fiber-optic based gas sensing in the UV region

Cited by 5 publications

References 0 publications

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

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

A Sensitive and Portable Deep-UV Absorbance Detector with a Microliter Gas Cell Compatible with Micro GC

Optical Fibers for Biomedical Applications

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