Abstract
In this Letter, a direct method is proposed to measure the electron number density distribution for high-temperature complex flow fields. The experimental system of two-wavelength moiré tomography is established, while four key issues are solved and well clarified. The argon arc plasma is adopted as an example for experiment, while 532 and 808 nm are chosen as the two probe wavelengths. The results indicate that the electron number density's distribution of the measured argon arc plasma can be directly obtained by two-wavelength moiré tomography, which can avoid the imprecision of the indirect methods. This Letter can provide some reference for various high-temperature and high-density gradient flow field optical measurement and diagnosis.
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