Abstract: A system for characterizing contamination or integrity information from within a pipe, including a flexible tubular membrane which is extendable within the pipe and inflatable to a diameter effective to urge the tubular membrane against the rigid wall. The tubular membrane has a first end and a second end, and is initially rolled up and connected to a reel inside of a deployment system. A tether connects the deployment system to a characterization tool retained within the tubular membrane, which is attached adjacent to the second end of the tubular membrane. When the system is engaged, pressurized fluid enters the tubular membrane causing the membrane to invert and distend into and through the pipe's interior.

Abstract: A waveguide mode converting apparatus especially of the TM.sub.01 to TE.sub.11 converting type and usable in circuit waveguide apparatus with desirable high efficiency and relatively small physical size is disclosed. The mode converter employs the combination of an asymmetrically shaped conical frustum waveguide segment together with a radially disposed fin having tapered input and output or ramp surfaces. Details of a 1.3 gigahertz embodiment of the mode converter including dimensions are included along with the results of efficiency measuring and indications of alternate arrangements of the invention.