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Sensors 2010, 10(6), 6081-6091; doi:10.3390/s100606081
Article

A Compact Tunable Diode Laser Absorption Spectrometer to Monitor CO2 at 2.7 µm Wavelength in Hypersonic Flows

1
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1
,
1
,
2
,
2
 and
1,*
1 The French Aerospace Lab, ONERA, BP72-29 avenue de la Division Leclerc, FR-92322 Chatillon cedex, France 2 Von Karman Institute, 1640 Rhode-St-Génèse, Belgium
* Author to whom correspondence should be addressed.
Received: 21 May 2010 / Revised: 4 June 2010 / Accepted: 8 June 2010 / Published: 17 June 2010
(This article belongs to the Section Chemical Sensors)
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Abstract

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.
Keywords: gas sensor;tunable diode laser absorption spectroscopy; distributed feedback (DFB); laser velocimetry; CO2 monitoring; hypersonic flow; Mars atmosphere gas sensor; tunable diode laser absorption spectroscopy; distributed feedback (DFB); laser velocimetry; CO2 monitoring; hypersonic flow; Mars atmosphere
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Vallon, R.; Soutadé, J.; Vérant, J.-L.; Meyers, J.; Paris, S.; Mohamed, A. A Compact Tunable Diode Laser Absorption Spectrometer to Monitor CO2 at 2.7 µm Wavelength in Hypersonic Flows. Sensors 2010, 10, 6081-6091.

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