High speed cavity ringdown spectroscopy with increased spectral resolution by synchronous laser and cavity tuning

Author

Debecker, I. ; Mohamed, A.K. ; Romanini, D.

Author_Institution

Office Nat. d´´Etude et de Recherches Aerospatiales, Palaiseau, France

fYear

2005

fDate

12-17 June 2005

Firstpage

445

Abstract

Non-intrusive optical sensing tools are needed to monitor trace molecular oxygen (O₂) in reactive flows generated in blow-down wind tunnels. Continuous-wave cavity ringdown spectroscopy (cw-CRDS) is a promising candidate to perform such analysis. However, those measurements impose strong constraints since flow generation is realized during short gusts (200 ms), characterized by low pressures and aerodynamic conditions changing rapidly. The crucial issue therefore consists in developing CRDS as a fast and high-resolution diagnostic method.

Keywords

aerodynamics; chemical variables measurement; measurement by laser beam; optical sensors; oxygen; spectrochemical analysis; wind tunnels; 200 ms; O₂; aerodynamic conditions; blow-down wind tunnels; cavity tuning; continuous-wave cavity ringdown spectroscopy; high speed cavity ringdown spectroscopy; high-resolution diagnostic method; nonintrusive optical sensing; reactive flows; spectral resolution; synchronous laser; trace molecular oxygen monitoring; Character generation; Fluid flow measurement; Image motion analysis; Laser tuning; Monitoring; Optical sensors; Optical tuning; Performance analysis; Ring lasers; Spectroscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on

Print_ISBN

0-7803-8974-3

Type

conf

DOI

10.1109/CLEOE.2005.1568223

Filename

1568223