Fiber-optic detection device for GC-UV

Eckhardt, H. S.; Dominick, H.; Grattan, K. T. V.; Graubner, Konrad; Klein, Karl-Friedrich; Spangenberg, Bernd; Sun, Tao

doi:10.1117/12.717694

Cited by 1 publication

(3 citation statements)

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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%

“…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]. A mixture of compounds (Ethylbenzene, bromobenzene, cis-decahydronaphtalene, trans-decahydronaphtalene, Buthyrophenone, diphenylsulfoxide, carbon disulphide) with close retention time was tested, spectrum was recorded in the time domain for wavelength range 170–320 nm, and all the compounds were distinctively separated as represented in Figure 27b.…”

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%

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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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