An optical fibre based ultra violet and visible absorption spectroscopy system for ozone concentration monitoring

O'Keeffe, Sinéad; Fitzpatrick, Colin; Lewis, Elfed

doi:10.1016/j.snb.2007.02.023

Cited by 40 publications

(42 citation statements)

References 10 publications

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“…Researchers have also applied UV light to the chemiluminometric measurement of atmospheric ozone [8]. There have been attempts to use optical fibers for sensing [9]. However, there are few reports on the determination of ozone concentration in the air using Hg lamp systems, because of the difficulties in accurate system construction with a high sensitivity suitable for ozone monitoring and with a long life that would provide an accuracy of approximately ±0.5%.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-Emitting Diode for Detection of Natural Hazard Ozone

Aoyagi¹,

Takeuchi²,

Yoshida³

et al. 2012

JEP

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Recently ozone is one of natural hazards which comes from cars, industry using ozone for sterilization of organic and inorganic materials and for water purification. So, ozone sensing becomes very important, and convenient and accurate ozone sensor is required. A new high sensitivity ozone sensing system using an deep ultra-violet light emitting diode (DUV-LED) operated at the wavelength of 280 nm has been successfully constructed. The fabrication of diode operated at 280 nm is much easier than that of DUV-LED operated at Hg lamp wavelength of 254 nm. The system is compact and possible to sense the ozone concentration less than 0.1 ppm with an accuracy of 0.5% easily with low power DUV-LED of around 200 micro Watts operated at 280 nm without any data processing circuit.

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Section: Introductionmentioning

confidence: 99%

High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-Emitting Diode for Detection of Natural Hazard Ozone

Aoyagi¹,

Takeuchi²,

Yoshida³

et al. 2012

JEP

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“…light signal modulation) and the sample to be measured takes place outside the optical fibre cable in a gas cell generally referred to a cuvette [8,64]. It is illustrated in Figure 4.…”

Section: Extrinsic Optical Sensorsmentioning

confidence: 99%

“…Hence, lots of research efforts are devoted to investigate the accurate value of ozone absorption cross section [64,[75][76][77][78]. Spectralcalc.com simulator has been used in this review to show the effect of temperature on absorption cross section in the Hartley band.…”

Section: The Absorption Cross Section Of Ozonementioning

confidence: 99%

Fundamental Review to Ozone Gas Sensing Using Optical Fibre Sensors

et al. 2015

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The manuscript is a review of basic essentials to ozone gas sensing with optical methods. Optical methods are employed to monitor optical absorption, emission, reflectance and scattering of gas samples at specific wavelengths of light spectrum. In the light of their importance in numerous disciplines in analytical sciences, necessary integral information that serves both as a basis and reference material for intending researchers and others in the field is inevitable. This review provides insight into necessary essentials to gas sensing with optical fibre sensors. Ozone gas is chosen as a reference gas. Simulation results for ozone gas absorption cross section in the ultraviolet (UV) region of the spectrum using spectralcalc.com simulation have also been included.

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“…Length of Gas Cell (L) Gas Oulet Gas Inlet Fig.1: Transmission type gas cell The sensitivity, lower detection limit and the resolution of an absorption spectroscopic ozone sensor are proportional to its optical path length and thus longer gas cells yields better operations in terms of sensitivity, resolution and lower detection limits [10][11][12]; this however results in unsatisfactory sensing speed [13,14]. In this study, we investigate the effect of the inlet diameter of a transmission type optical gas sensor on the sensing speed of an optical sensor.…”

Section: Beam Of Lightmentioning

confidence: 99%

“…The transmission of light in the fiber optic cable is governed by total internal reflections; light transmission in the gas cell is however, regulated by Beer's law; which states that: the transmittance T of a monochromatic light with a path length of light , through a gas sample with a concentration C (mole cm -3 ) and decadic molar absorption coefficient Ɛ (cm 2 /mole) [10] is expressed mathematically by the Beer Bouguer-Lambert law as:…”

Section: IImentioning

confidence: 99%

Investigation of the effect of inlet radius on the response time of a transmission type ozone sensor

David

Marcus

Yaacob

et al. 2014

2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE)

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Abstract-The effect of inlet radius of a transmission type optical gas cell on its response time is reported. Six gas cells of varying lengths, and internal radius of 0.32cm were considered at first and then other internal diameters were also investigated afterwards. The effect of inlet radius is easily discernible at all velocities considered; however it is more pronounced at lower flow rates. At a velocity of 16.79cm/s of ozone gas, and for a target sensing time of ≤ 0.5 seconds; we observed that the inlet radius requirements for gas cells of varying lengths and varying internal diameters is not the same for a specific target sensing speed. The length and the internal radius of a gas cell are proportional to its inlet radius.

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An optical fibre based ultra violet and visible absorption spectroscopy system for ozone concentration monitoring

Cited by 40 publications

References 10 publications

High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-Emitting Diode for Detection of Natural Hazard Ozone

High-Sensitivity Ozone Sensing Using 280 nm Deep Ultraviolet Light-Emitting Diode for Detection of Natural Hazard Ozone

Fundamental Review to Ozone Gas Sensing Using Optical Fibre Sensors

Investigation of the effect of inlet radius on the response time of a transmission type ozone sensor

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