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  1. No Access

    Chapter and Conference Paper

    The Rotational Dual Broadband Approach and Noise Considerations in CARS Spectroscopy

    New experimental approaches to broadband CARS have recently been presented [1–3]. Rotational dual broadband CARS (RDBC) has shown to have several interesting properties for CARS thermometry [3]. By using an ap...

    M. Aldén, P.-E. Bengtsson, H. Edner, S. Kröll, D. Nilsson… in Laser Spectroscopy VIII (1987)

  2. No Access

    Article

    Application of a pulsed laser for soot measurements in premixed flames

    A pulsed Nd: YAG laser has been used to perform scattering/extinction measurements in flat, premixed methane/oxygen flames to determine soot particle sizes, number concentrations and soot volume fractions. A d...

    P. -E. Bengtsson, M. Aldén in Applied Physics B (1989)

  3. No Access

    Article

    An evaluation of precision and systematic errors in vibrational CARS thermometry

    The extraction of temperatures from experimental CARS spectra is discussed and demonstrated in an electrically heated over and a low-pressure flame. The present work is focused, in particular, on how the preci...

    S. Kröll, M. Aldén, P. -E. Bengtsson, C. Löfström in Applied Physics B (1989)

  4. No Access

    Article

    Is rotational CARS an alternative to vibrational CARS for thermometry?

    Recent developments in rotational CARS thermometry and critical issues when comparing vibrational and rotational CARS thermometry are described. In particular, the development of dual broadband rotational CARS...

    S. Kröll, P.-E. Bengtsson, M. Aldén, D. Nilsson in Applied Physics B (1990)

  5. No Access

    Article

    Carbon atom fluorescence and C2 emission detected in fuel-rich flames using a UV laser

    Laser-induced fluorescence from carbon atoms, excited at the two-photon resonances around 280 nm, has been detected in fuel-rich hydrocarbon flames together with Swan band emission from the C2 radical, which was ...

    U. Westblom, P.-E. Bengtsson, M. Aldén in Applied Physics B (1991)

  6. No Access

    Article

    Soot-visualization strategies using laser techniques

    Strategies for spatially resolved soot volume-fraction measurements have been investigated in sooting laboratory flames with known soot characteristics. Two techniques were compared: Laser-Induced Fluorescence...

    P. -E. Bengtsson, M. Aldén in Applied Physics B (1995)

  7. No Access

    Article

    Oxygen concentration and temperature measurements in N2–O2 mixtures using rotational coherent anti-Stokes Raman spectroscopy

    The accuracy and precision of oxygen concentration and temperature measured by dual-broadband rotational Coherent Anti-Stokes Raman Spectroscopy (CARS) were investigated in nitrogen-oxygen mixtures at atmosphe...

    L. Martinsson, P. -E. Bengtsson, M. Aldén in Applied Physics B (1996)

  8. No Access

    Article

    Two-dimensional imaging of glyoxal (C2H2O2) in acetylene flames using laser-induced fluorescence

    H2O2). Laser-induced fluorescence spectra from glyoxal vapor using the same excitation wavelength of 428 nm showed the same strongest lines as the signal from the flame. Glyoxal was visualized in two different mo...

    F.E. Tichy, T. Bjorge, B.F. Magnussen, P.E. Bengtsson, F. Mauss in Applied Physics B (1998)

  9. No Access

    Article

    Temperature and concentration measurements in acetylene-nitrogen mixtures in the range 300–600 K using dual-broadband rotational CARS

    Pure rotational coherent anti-Stokes Raman scattering (CARS) experiments have been performed in acetylene for temperatures ranging from 294 to 582 K, and in mixtures of acetylene and nitrogen in the mole fract...

    J. Bood, P.-E. Bengtsson, M. Aldén in Applied Physics B (2000)

  10. No Access

    Article

    Laser-induced incandescence for soot particle size and volume fraction measurements using on-line extinction calibration

    A novel technique for two-dimensional measurements of soot volume fraction and particle size has been developed. It is based on a combined measurement of extinction and laser-induced incandescence using Nd:YAG...

    B. Axelsson, R. Collin, P.E. Bengtsson in Applied Physics B (2001)

  11. No Access

    Article

    Quantitative three-dimensional imaging of soot volume fraction in turbulent non-premixed flames

    A three-dimensional (3-D) imaging system for studies of reactive and non-reactive flows is described. It can be used to reveal the topology of turbulent structures and to extract 3-D quantities, such as conce...

    J. Hult, A. Omrane, J. Nygren, C. Kaminski, B. Axelsson, R. Collin… in Experiments in Fluids (2002)

  12. No Access

    Article

    Dual-broadband rotational CARS modelling of nitrogen at pressures up to 9 MPa. I. Inter-branch interference effect

    An improved model for pure rotational coherent anti-Stokes Raman scattering (CARS) has been developed for the dual-broadband approach. This model takes into account the fact that coherent anti-Stokes as well a...

    M. Afzelius, P.-E. Bengtsson in Applied Physics B (2002)

  13. No Access

    Article

    Dual-broadband rotational CARS modelling of nitrogen at pressures up to 9 MPa. II. Rotational Raman line widths

    Rotational coherent anti-Stokes Raman spectroscopy (CARS) is a well-established spectroscopic technique for thermometry at pre-combustion temperatures and atmospheric pressure. However, at pressures of several...

    M. Afzelius, P.-E. Bengtsson, J. Bood, J. Bonamy, F. Chaussard… in Applied Physics B (2002)

  14. No Access

    Article

    Soot visualisation by use of laser-induced soot vapourisation in combination with polarisation spectroscopy

    A novel approach to the visualisation of soot is presented. It relies on a combination of laser-induced soot vapourisation and consecutive polarisation spectroscopy. Upon soot vapourisation, molecular fragment...

    J. Walewski, M. Rupinski, H. Bladh, Z.S. Li, P.-E. Bengtsson, M. Aldén in Applied Physics B (2003)

  15. No Access

    Article

    Characteristics of laser-induced incandescence from soot in studies of a time-dependent heat- and mass-transfer model

    The temporal behavior of the laser-induced incandescence (LII) signal is often used for soot-particle sizing, which is possible because the cooling behavior of a laser-heated particle is dependent on the parti...

    H. Bladh, P.-E. Bengtsson in Applied Physics B (2004)

  16. No Access

    Article

    Experimental and theoretical comparison of spatially resolved laser-induced incandescence (LII) signals of soot in backward and right-angle configuration

    In-situ measurements of soot volume fraction in the exhausts of jet engines can be carried out using the laser-induced incandescence (LII) technique in backward configuration, in which the signal is detected i...

    H. Bladh, P.-E. Bengtsson, J. Delhay, Y. Bouvier, E. Therssen… in Applied Physics B (2006)

  17. No Access

    Article

    Modeling laser-induced incandescence of soot: a summary and comparison of LII models

    We have performed a comparison of ten models that predict the temporal behavior of laser-induced incandescence (LII) of soot. In this paper we present a summary of the models and comparisons of calculated temp...

    H.A. Michelsen, F. Liu, B.F. Kock, H. Bladh, A. Boiarciuc, M. Charwath… in Applied Physics B (2007)

  18. No Access

    Article

    On the dependence of the laser-induced incandescence (LII) signal on soot volume fraction for variations in particle size

    “The laser-induced incandescence (LII) signal is proportional to soot volume fraction” is an often used statement in scientific papers, and it has – within experimental uncertainties – been validated in compar...

    H. Bladh, J. Johnsson, P.-E. Bengtsson in Applied Physics B (2008)

  19. No Access

    Article

    Soot volume fraction measurements in aero-engine exhausts using extinction-calibrated backward laser-induced incandescence

    Control and reduction of soot particle emissions from aeronautic turbines requires a monitoring system suitable for quantification of these emissions. Currently, such emissions are estimated using the techniqu...

    J. Delhay, P. Desgroux, E. Therssen, H. Bladh, P.-E. Bengtsson… in Applied Physics B (2009)

  20. No Access

    Article

    Influence of spatial laser energy distribution on evaluated soot particle sizes using two-colour laser-induced incandescence in a flat premixed ethylene/air flame

    Time-resolved laser-induced incandescence (LII) has been developed rapidly during the last decade as a useful non-intrusive technique for particle size determination. Still several parameters should be investi...

    H. Bladh, J. Johnsson, P.-E. Bengtsson in Applied Physics B (2009)

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