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Reconstruction of temperature field Ar plasma jet using CCD spectrum tomography technology

An Orthogonal area array CCD spectrum tomography experimental system has been proposed to realize real-time temperature diagnosis of Ar plasma jet. According to two-orthogonal-view reconstruction algorithm, two orthogonal intensity signals can realize the emission coefficient field construction, then using spectrum relativity intensity method, temperature field can be reconstructed. In this paper, two filters with different wavelength have been placed in front of two-view orthogonal CCD, and plasma jet image has been obtained, of which point light intensity has been gotten using digital image process technology according to the image of Ar plasma jet from CCD. Then using two-orthogonal-view reconstruction algorithm and spectrum relativity intensity method reconstructed the Ar plasma jet temperature field. The result shows that it agreed with the results from fiber scanning diagnosis system. The proposed experimental device contented the real-time diagnosis request of plasma jet. It provided stabile base for real-time diagnosis of plasma jet density field, pressure field and velocity field.