A compact tunable diode laser absorption spectrometer to monitor CO2 at 2.7 μm wavelength in hypersonic flows.
Since the beginning of the Mars planet exploration, the characterization of carbon dioxide hypersonic flows to simulate a spaceship's Mars atmosphere entry conditions has been an important issue. We have developed a Tunable Diode Laser Absorption Spectrometer with a new room-temperature operating antimony-based distributed feedback laser (DFB) diode laser to characterize the velocity, the temperature and the density of such flows. This instrument has been tested during two measurement campaigns in a free piston tunnel cold hypersonic facility and in a high enthalpy arc jet wind tunnel. These tests also demonstrate the feasibility of mid-infrared fiber optics coupling of the spectrometer to a wind tunnel for integrated or local flow characterization with an optical probe placed in the flow.
The French Aerospace Lab, ONERA, BP72-29 avenue de la Division Leclerc, FR-92322 Chatillon cedex, France. rvallon@onera.fr
Raphäel
R
Vallon
Jacques
J
Soutadé
Jean-Luc
JL
Vérant
Jason
J
Meyers
Sébastien
S
Paris
Ajmal
A
Mohamed
D000965:Antimony / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis*; D003198:Computer Simulation; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D005240:Feasibility Studies; D017078:Laser-Doppler Flowmetry / Q000295:instrumentation / Q000379:methods; D054023:Lasers, Semiconductor; D008954:Models, Biological; D013054:Spectrophotometry, Atomic / Q000295:instrumentation*; D014465:Ultrasonics / Q000295:instrumentation / Q000379:methods
D002245:Carbon Dioxide; D000965:Antimony