A Microwave Reflection Method to Determine the Complex Permittivity of Time-Varying Plasma

A microwave reflection method is presented to determine the complex permittivity of time-varying plasma. Due to the existing of multiple solutions in the extraction of permittivity from reflection coefficient, a linear variation approximation is proposed with two unknown timing coefficients to be defined with the Simplex algorithm. At last, the measurement results of shock-tube excited plasma are presented.