Fig. 1. Cutaway schematic of time domain reflectometry (TDR) pressure cell showing components: (a) input/output port for P.M. solution exchange (coarse membrane), (b) temperature control port (circulating water bath), (c) input/output port for P.M. solution exchange (fine membrane), (d) 50 ohm coaxial cable, (e) porous stainless steel inner tube (0.5 um pore size), (f) solid stainless steel sleeve, and (g) porous stainless steel outer tube (40 µm pore size). Inset picture shows actual cell with cap removed.