• Aucun résultat trouvé

ROTATIONAL COHERENT ANTI-STOKES RAMAN SCATTERING FOR COMBUSTION RESEARCH

N/A
N/A
Info
Télécharger
Protected

Academic year: 2021

Partager "ROTATIONAL COHERENT ANTI-STOKES RAMAN SCATTERING FOR COMBUSTION RESEARCH"

Copied!
2
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

HAL Id: jpa-00227021

https://hal.archives-ouvertes.fr/jpa-00227021

Submitted on 1 Jan 1987

HAL

is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire

HAL, est

destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

ROTATIONAL COHERENT ANTI-STOKES RAMAN SCATTERING FOR COMBUSTION RESEARCH

E. Magens, A. Leipertz

To cite this version:

E. Magens, A. Leipertz. ROTATIONAL COHERENT ANTI-STOKES RAMAN SCATTERING

FOR COMBUSTION RESEARCH. Journal de Physique Colloques, 1987, 48 (C7), pp.C7-772-C7-

772. �10.1051/jphyscol:19877195�. �jpa-00227021�

(2)

JOURNAL DE PHYSIQUE

Colloque C7, suppl6ment au n012, Tome 48, decembre 1987

ROTATIONAL COHERENT ANTI-STOKES RAMAN SCATTERING FOR COMBUSTION RESEARCH

E. MAGENS and A . LEIPERTZ

Riihr-Universitdt Bochum, Institut fur Themo-und ~luiddynamik Experimental Warme- und Stoffiibertragung, Postfach 102148, 0-4630 Bochum 1, F.R.G.

Coherent Anti-Stokes Raman Scattering (CARS) has been used extensively as a diagnostic technique for temperature measurements in combustion system, in general by employing the relative intensities of the vibrational band of the investigated gas species (mostly N2). Pure rotational CARS is superior to vibrational CARS for thermometry near room temperature, since the spectra are easily resolvable compared with the congestion of the rotational lines in the vibrational bands of the Q-branch spectra. The rotational Raman cross section for rotational CARS is larger than the vibrational CARS cross section and the Raman linewidth is more narrow for rotational CARS than for vibrational CARS, both tending to give a higher rotational CARS intensity. On the other hand, rotational CARS intensities are substantially reduced at higher temperatures, and in technical flames an interference of CARS contributions in the rotational spectra of different gas molecules present may complicate a temperature and concentration evaluation. The difficulty in separating these different contributions may be overcome by using Fourier analysis, which also can be used simultaneously for data reduction. Applying this technique to calculated pure and noisy rotational CARS spectra and also to experi- mentally obtained ones, temperature and concentration, determination is demonstrated for simple flames.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19877195

Références

Télécharger maintenant ( PDF - 2 Page - 201.07 KB )

Documents relatifs

Use of Stokes and anti‐Stokes Raman scattering for new applications

Keywords : Stokes and anti-Stokes Raman scattering, luminescence, phonon bands, first and second order scattering, population

ANTI-STOKES RAMAN LASERS : A CONCEPT FOR THE GENERATION OF SHORT-WAVELENGTH COHERENT RADIATION

1.) An appropriate three level scheme with suitable resonances has to be found. For wavelengths down to about 50 nm, molecules and atoms may be used, for much shorter

Multiplex coherent anti-Stokes Raman scattering highlights state of chromatin condensation in CH region

Analysis of interphase and mitotic, stained, fixed and living, HEK293 cells and fibroblasts, including bright-field, fluorescence and MCARS (CH 2 , CH 3 ) imaging.. Fixed and

Multiplex coherent anti-Stokes Raman scattering microspectroscopy detection of lipid droplets in cancer cells expressing TrkB

When HEK-Clone2 cells were simultaneously incubated with BDNF and K252a, MCARS micro- spectroscopy analysis revealed an absence of lipid droplets formation (Fig. 5A and

Fourier-transform coherent anti-Stokes Raman scattering microscopy.

By varying the time delay between the pulses, we time-resolve the CARS signal, permitting easy removal of the nonresonant back- ground while providing high resolution,

Interferometric Fourier transform coherent anti-stokes Raman scattering

Figure 2(a) shows the spectra of the pump and probe pulses used in the calculations (left) and experiment (right), along with the locations of the long and short pass filters used

Resonance-enhanced coherent anti-Stokes Raman scattering in C2

Abstract 2014 We have obtained resonance-enhanced Coherent Anti-Stokes Raman Scattering (CARS) spectra of the C2 radical formed in a microwave discharge and in an

Influence of the Raman depolarisation ratio on far-field radiation patterns in coherent anti-Stokes Raman scattering (CARS) microscopy

Influence of the Raman depolarisation ratio on far-field radiation patterns in coherent anti-Stokes Raman scattering (CARS) microscopy.. Journal of the European Optical Society :