Abstract
Since the beginning of Mars planet exploration, the characterization of carbon dioxide hypersonic flows to simulate a Mars spaceship atmosphere reentry conditions has been an important issue. We developed a Tunable Diode Laser Absorption Spectrometer with new room-temperature operating DFB diode lasers to characterize the velocity, the temperature and the density of such flows. This instrument has been tested during two measurement campaign in a free piston tunnel cold hypersonic facility and in a high enthalpy arc jet wind tunnel. These tests also demonstrate the feasibility of fiber optics coupling with wind tunnel for integrated or local flow characterization with an optical probe.
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