Title :
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
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;
Conference_Titel :
Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on
Print_ISBN :
0-7803-8974-3
DOI :
10.1109/CLEOE.2005.1568223
