High enthalpy arc-heated plasma flow diagnostics by tunable diode laser absorption spectroscopy

Xin Lin; Lianzhong Chen; Hui Zeng; Dongbin Ou; Yonghui Dong

doi:10.1117/12.2266510

12 May 2017 High enthalpy arc-heated plasma flow diagnostics by tunable diode laser absorption spectroscopy

Xin Lin, Lianzhong Chen, Hui Zeng, Dongbin Ou, Yonghui Dong

Proceedings Volume 10173, Fourth International Symposium on Laser Interaction with Matter; 101731A (2017) https://doi.org/10.1117/12.2266510
Event: 4th International Symposium on Laser Interaction with Matter, 2016, Chengdu, China

Abstract

This paper reports the laser absorption measurements of atomic oxygen in the FD04 arc-heater at China Academy of Aerospace Aerodynamics (CAAA). An atomic oxygen absorption line at 777.19 nm is utilizied for detecting the population of electronically excited oxygen atom in an air plasma flow. A scanned-wavelength direct absorption mode is used in this study. The laser is scanned in wavelength across the absorption feature at a rate of 200 Hz. Under the assumption of thermal equilibrium, time-resolved temperature measurements are obtained on one line-of-sight in the arc-heater. The good agreement of the temperature inferred from the sonic throat method suggests the equilibrium assumption is valid. These results illustrate the feasibility of the diode laser sensors for flow parameters in high enthalpy arc-heated facilities.

Citation Download Citation

Xin Lin, Lianzhong Chen, Hui Zeng, Dongbin Ou, and Yonghui Dong "High enthalpy arc-heated plasma flow diagnostics by tunable diode laser absorption spectroscopy", Proc. SPIE 10173, Fourth International Symposium on Laser Interaction with Matter, 101731A (12 May 2017); https://doi.org/10.1117/12.2266510

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