Patrick Pribyl

The hairpin resonator probe was first introduced by Stenzel11. R. L. Stenzel, Rev. Sci. Instrum. 47, 603 (1976). https://doi.org/10.1063/1.1134697 in 1976 as a technique to determine the plasma density via measurements of the resonant frequency of a quarter-wavelength resonant transmission line immersed in a plasma. The plasma density is determined by measuring the difference between the resonant frequency of the transmission line in vacuum and that in a plasma.