Detection of Optical Radiation in NOx Optoelectronic Sensors Employing Cavity Enhanced Absorption Spectroscopy

Wojtas, J.

doi:10.5772/19201

Cited by 3 publications

(5 citation statements)

References 41 publications

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“…Taking into consideration the described noise sources, the formula for PMT signal-to-noise ratio determination is given by [74]:

\frac{S_{ph}}{N_{ph}} = \frac{I_{s}^{2}}{I_{ns}^{2} + I_{nd}^{2} + I_{nb}^{2} + I_{nRL}^{2}}

…”

Section: Signal Processing Unitmentioning

confidence: 99%

“…Sensitivity of the method depends on the distance between the radiation source and the photoreceiver. For systems where this distance is a few kilometres, the obtained sensitivity is better than 1 ppb in the case of NO 2 detection [74]. For NO detection, the absorption effect at the wavelength of 227 nm is used, but influence of other gases (NO 2 , SO 2 ) at the same absorption line is observed.…”

Section: Selected Experimental Applicationsmentioning

confidence: 99%

“…Applications of cells with lengths of a few dozen meters provide the possibility to achieve a sensitivity of 1 ppb and higher [74]. In the TLAS gas absorption lines are analysed by optical radiation at a well-defined but adjustable or tuneable wavelength.…”

Section: Selected Experimental Applicationsmentioning

confidence: 99%

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Aspects of the Application of Cavity Enhanced Spectroscopy to Nitrogen Oxides Detection

Wojtas

Mikołajczyk

Bielecki

2013

Sensors

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This article presents design issues of high-sensitive laser absorption spectroscopy systems for nitrogen oxides (NOx) detection. Examples of our systems and their investigation results are also described. The constructed systems use one of the most sensitive methods, cavity enhanced absorption spectroscopy (CEAS). They operate at different wavelength ranges using a blue—violet laser diode (410 nm) as well as quantum cascade lasers (5.27 μm and 4.53 μm). Each of them is configured as a one or two channel measurement device using, e.g., time division multiplexing and averaging. During the testing procedure, the main performance features such as detection limits and measurements uncertainties have been determined. The obtained results are 1 ppb NO2, 75 ppb NO and 45 ppb N2O. For all systems, the uncertainty of concentration measurements does not exceed a value of 13%. Some experiments with explosives are also discussed. A setup equipped with a concentrator of explosives vapours was used. The detection method is based either on the reaction of the sensors to the nitrogen oxides directly emitted by the explosives or on the reaction to the nitrogen oxides produced during thermal decomposition of explosive vapours. For TNT, PETN, RDX and HMX a detection limit better than 1 ng has been achieved.

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“…Taking into consideration the described noise sources, the formula for PMT signal-to-noise ratio determination is given by [74]:

\frac{S_{ph}}{N_{ph}} = \frac{I_{s}^{2}}{I_{ns}^{2} + I_{nd}^{2} + I_{nb}^{2} + I_{nRL}^{2}}

…”

Section: Signal Processing Unitmentioning

confidence: 99%

Section: Selected Experimental Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Aspects of the Application of Cavity Enhanced Spectroscopy to Nitrogen Oxides Detection

Wojtas

Mikołajczyk

Bielecki

2013

Sensors

Self Cite

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“…The system is much less sensitive to mechanical instabilities. CEAS sensors attain a detection limit of about 10 -9 cm -1 [96,97]. Another advantage is that due to off-axis illumination of the front mirror the interference of the light source (a laser) by the optical feedback from the cavity is eliminated.…”

Section: Cavity Enhanced Absorption Spectroscopymentioning

confidence: 98%

Sensors and Systems for the Detection of Explosive Devices - An Overview

Bielecki¹,

Janucki²,

Kawalec³

et al. 2012

Metrology and Measurement Systems

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The paper presents analyses of current research projects connected with explosive material sensors. Sensors are described assigned to X and γ radiation, optical radiation sensors, as well as detectors applied in gas chromatography, electrochemical and chemical sensors. Furthermore, neutron techniques and magnetic resonance devices were analyzed. Special attention was drawn to optoelectronic sensors of explosive devices.

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“…This provides the opportunity to determine the absorption coefficient with the detection limit better than 10 -9 cm -1 [67,68]. Various modifications of this ap− proach have been already elaborated and different methods of Q−factor measurements have been applied [69].…”

Section: Optical Detection Of Explosivesmentioning

confidence: 99%

Towards optoelectronic detection of explosives

Wojtas

Stacewicz

Bielecki

et al. 2013

Opto-Electronics Review

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Detection of explosives is an important challenge for contemporary science and technology of security systems. We present an application of NOx sensors equipped with concentrator in searching of explosives. The sensors using CRDS with blue — violet diode lasers (410 nm) as well as with QCL lasers (5.26 μm and 4.53 μm) are described. The detection method is based either on reaction of the sensors to the nitrogen oxides emitted by explosives or to NOx produced during thermal decomposition of explosive vapours. For TNT, PETN, RDX, and HMX the detection limit better than 1 ng has been achieved.

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Detection of Optical Radiation in NOx Optoelectronic Sensors Employing Cavity Enhanced Absorption Spectroscopy

Cited by 3 publications

References 41 publications

Aspects of the Application of Cavity Enhanced Spectroscopy to Nitrogen Oxides Detection

Aspects of the Application of Cavity Enhanced Spectroscopy to Nitrogen Oxides Detection

Sensors and Systems for the Detection of Explosive Devices - An Overview

Towards optoelectronic detection of explosives

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