Reconstruction of three-dimensional arc-plasma temperature fields by orthographic and double-wave spectral tomography

摘要

This paper presents a technique to diagnose the three-dimensional temperature fields of arc plasmawith orthographic and double-wave spectral tomography. First, the system with two orthographicdirectional CCD image real-time cameras is adopted to get the information of spectrum intensity relatedto the gray scale of arc plasma. Second, the improved computerized tomography iterative techniquewhich accords with the least-square and max-entropy criterions, simultaneously, has been used toreconstruct the distributions of different emission coefficients, which shows superiority to theconventional tomography algorithms. Finally, based on plasma physical theory, the spectrum relative-intensity method has been used to reconstruct the distribution features of three-dimensionaltemperature fields. The experimental results have shown the effectiveness of this measurement systemwith high-precision and real-time ability.