Effects of pressure and temperature fluctuations on near-infrared measurements of methane in underground coal mines

Shemshad, J.; Aminossadati, Saiied M.; Bowen, Warwick P.; Kizil, Mehmet S.

doi:10.1007/s00340-011-4801-z

Cited by 21 publications

(12 citation statements)

References 16 publications

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“…Methane is a spherical-top tetrahedral molecule with four C-H bonds. The spectroscopic behaviour of methane has been studied extensively (Frankenberg et al, 2008;Shemshad et al, 2011) due to its importance in planetary and atmospheric processes, as well as in the mining industry.…”

Section: Spectroscopy Of Methane In the Near Infra-red Regionmentioning

confidence: 99%

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis

Wilson

Lengden

et al. 2017

Flow Measurement and Instrumentation

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A feasibility study is presented and the achieved key design milestones towards the first application of Chemical Species Tomography by Near-IR Absorption Tomography on a heavy duty, large-bore marine engine to visualise relative mixture strength are described. The engine is equipped with pre-chamber ignition and operates using Liquefied Natural Gas with > 88.9 % methane content. Operation of the engine under maximum-load conditions is a key design requirement, with peak cylinder pressure and mean temperature exceeding 127,510 Torr (170 bar) and 850 K respectively. The near-IR spectroscopic behaviour of methane is examined for suitable absorption and reference regions for the above application. In particular, the spectroscopic absorption around the 2ν3 transition region near 1,666 nm is approximated by simulation using data from the HITRAN database under worst-case conditions. The simulation results are compared with methane spectra experimentally acquired at high temperature and ambient pressure. Interference from other chemical species as well as measurement linearity is also investigated. A 31-laser beam tomographic imaging array is proposed, which has been optimised to achieve higher spatial resolution performance in the vicinity of the pre-chamber’s orifices. To enable optical access, a novel, minimally-intrusive method is presented, utilising standard fibreoptics and collimator

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Section: Spectroscopy Of Methane In the Near Infra-red Regionmentioning

confidence: 99%

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Tsekenis

Wilson

Lengden

et al. 2017

Flow Measurement and Instrumentation

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“…Shemshad et al [12] investigated the most suitable band of methane absorption lines in near infrared spectrum. It was found that the Q band transitions of 2v 3 band make it a suitable target for spectroscopic detection of methane [12]. This can be experimentally and fundamentally discovered by investigating the detector output.…”

Section: Procedures Of 2f-wms Measurementsmentioning

confidence: 99%

“…Shemshad et el. [12] quantitatively studied the effects of pressure and temperature on the concentration measurement of methane applying 2f-WMS technique. Here, a new model is developed to quantify the effect of intensity variation on the methane concentration measurements as:…”

Section: Quantifying the Concentration Measurement Inaccuracymentioning

confidence: 99%

“…The measurement is based on the second harmonic wavelength modulation spectroscopy (2f-WMS). The Q(6) transition of the 2v 3 band of methane near 1666 nm has been selected because the transition is relatively free of interference from water vapour and absorption by other major gases [12]. The experimental investigation has been conducted on sequential 2-Cell and 3-Cell networks incorporating seven gas cells prefilled with methane gas at different concentrations [11].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of inaccuracy induced by intensity variation of a DFB laser in fibre optic multipoint 2 f -WMS measurements of methane near 1666 nm

Shemshad

2015

Sensors and Actuators A: Physical

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Please cite this article as: J. Shemshad, Analysis of inaccuracy induced by intensity variation of a DFB laser in fibre optic multipoint 2f-WMS measurements of methane near 1666nm, Sensors and Actuators: A Physical (2014), http://dx.doi.org/10.1016/j.sna. 2014.11.011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe analysis of methane concentration measurement inaccuracy induced by the intensity variation of a DFB laser at 1666 nm in a multipoint fibre optic sensor has been reported. The measurement is based on wavelength modulation spectroscopy (WMS) with second harmonic (2f) detection technique. The 2f signals are normalised to the average laser intensity and the detector gain to eliminate the effect of transmission loss and laser intensity variation on the measurements. The measurements are conducted at two laser intensities, defined as nominated intensity and 73% of the nominated intensity, to quantify the measurements errors due to the intensity change. The experimental results show that a significant change in the laser intensity yields differences in the 2f signals; as a result, errors were induced. A model is developed to quantify the errors in the concentration measurements. The maximum deviations for single cell, 2-Cell, and 3-Cell measurements to the given concentration of 10%, 7.5%, and 5.667% are calculated to be 9.764%, 7.2235%, and 5.368%, respectively. The concentration error increases with the cell number because of the accumulated background transmission loss of the gas cells in 2-Cell and 3-Cell in comparison to a single cell measurement.

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“…Hydrogen Sulphide (H2S) and Carbon Monoxide (CO) are the main mine gases that can be both toxic and explosive. Figure 2.1: Common hazardous mine gases [13][14][15][16] More than 50% of mine accidents including gas explosion, poisoning and suffocation are gasrelated [17]. According to the Mining Accident Database [18], gas explosion is the major source of accidents in Australian coal mines (Figure 2.2a).…”

Section: Mining Accidents Due To Gas Explosionmentioning

confidence: 99%

Performance Simulation of Hollow-Core Photonic Crystal Fibre as a Gas Sensor for Industry Applications

Masum¹

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Statement of parts of the thesis submitted to qualify for the award of another degree No works submitted towards another degree have been included in this thesis. Research Involving Human or Animal Subjects No animal or human subjects were involved in this research. viii Acknowledgements I would like to take this opportunity to thank all the people who have helped and supported me with my PhD journey this far. My principal advisor Associate Professor Saiied Aminossadati deserves special thanks. I am very grateful for his benevolent support, guidance, and friendship throughout this journey. The patience and attention he has dedicated to me are kindly appreciated.

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Effects of pressure and temperature fluctuations on near-infrared measurements of methane in underground coal mines

Cited by 21 publications

References 16 publications

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Towards in-cylinder chemical species tomography on large-bore IC engines with pre-chamber

Analysis of inaccuracy induced by intensity variation of a DFB laser in fibre optic multipoint 2 f -WMS measurements of methane near 1666 nm

Performance Simulation of Hollow-Core Photonic Crystal Fibre as a Gas Sensor for Industry Applications

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