Professor Paul Ewart: Publications

Detection of C₂H₂ and HCl using mid-infrared degenerate four-wave mixing with stable beam alignment: towards practical in situ sensing of trace molecular species

APPLIED PHYSICS B-LASERS AND OPTICS 98:2-3 (2010) 593-600

Authors:

ZW Sun, ZS Li, B Li, M Alden, P Ewart

Linear and Nonlinear Optical Methods for Multi-Gas and Multi-Parameter Sensing

Optica Publishing Group (2010) ltuc1

Authors:

P Ewart, B Williams, Y Arita, M Hamilton, GAD Ritchie

Multi-mode absorption spectroscopy, MUMAS, using wavelength modulation and cavity enhancement techniques

Applied Physics B: Lasers and Optics (2010) 1-9

Authors:

ML Hamilton, GAD Ritchie, Y Arita, P Ewart

High-resolution infrared polarization spectroscopy and degenerate four wave mixing spectroscopy of methane

APPLIED PHYSICS B-LASERS AND OPTICS 94:4 (2009) 715-723

Authors:

K Richard, P Ewart

Multi-component quantitative PLIF: Robust engineering measurements of cyclic variation in a firing spray-guided gasoline direct injection engine

SAE Technical Papers (2008)

Authors:

B Williams, P Ewart, R Stone, H Ma, H Walmsley, R Cracknell, R Stevens, D Richardson, J Qiao, S Wallace

Abstract:

Planar Laser-Induced Fluorescence has been widely accepted and applied to measurements of fuel concentration distributions in IC engines. The need for such measurements has increased with the introduction of Direct Injection (DI) gasoline engines, where it is critical to understand the influence of mixture inhomogeneity on ignition and subsequent combustion, and in particular the implications for cyclic variability. The apparent simplicity of PLIF has led to misunderstanding of the technique when applied to quantitative measurements of fuel distributions. This paper presents a series of engineering methods for optimizing, calibrating and referencing, which together demonstrate a quantitative measure of fuel concentration with an absolute accuracy of 10%. PLIF is widely used with single component fuels as carriers for the fluorescent tracers. This paper shows that this method inadequately describes a real fuel spray, and presents instead a method that uses a fully fractionated multi-component fuel for PLIF diagnostics. A series of measurements is presented of fuel distribution, early injection DI homogeneity and cyclic variation of injector plumes in a DI single cylinder optical research engine. Copyright © 2008 SAE International.

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