| CPC G01N 33/246 (2013.01) [G01D 5/3539 (2013.01)] | 20 Claims |

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1. A waveguide on access tube (WOAT) system, comprising:
a rigid tube having an interior wall and an exterior wall;
an inflatable tube;
a cap containing interface electronics and from which the inflatable tube is suspended;
a vertical array of TDR elements bonded to the inflatable tube, each of the vertical array of TDR elements having a respective time domain reflectometer (TDR) waveguide;
wherein when the inflatable tube is in an uninflated position, the vertical array of TDR elements is fitted within and spaced apart from the interior wall of the rigid tube.
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