Abstract
In order to estimate the emission intensity around a Mars Entry Capsule, an expansion tube is developed by updated the Hyper Velocity Shock Tube, which has been used for the radiation measurement from VUV to NIR wavelength region behind strong shock wave in Mars simulant gas. By expanded the low pressure tube inside the vacuum chamber, an expansion tube, which is called as Hyper Velocity Expansion Tube, is achieved. The test section, where test models are set, is located at the outlet of the expansion section. The test time and characteristics of the test flow are estimated theoretically and experimentally with air and CO2. The flow velocity can be around 6 km/s, which agree with a Mars entry condition. The radiation intensities in air and CO2 are measured. The shock stand-off distances are mm in air and in CO2, respectively.
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