Patent ID: 9618644
Date: 2017-04-11
CPC Classifications: G01L,G01V

Claim:
1. A sensing cable of a parallel spiral transmission line structure for distributed sensing and measuring of rock-soil mass deformation, comprising: a strip comprising a first elastic material; a spiral structure wrapping around the strip, the spiral structure comprising a single layer of two mutually-insulated wires running in parallel; and a shroud comprising a second elastic material, the shroud wrapping and covering the spiral structure, wherein the two mutually-insulated wires comprise a first wire and a second wire disposed side-by-side and next to one another, the first and second wires held together by an electrically insulating scarfskin such that a distance between the first and second wires remains substantially unchanged, wherein a matched impedance is connected between a first end of the first wire of the two mutually-insulated wires and a first end of the second wire of the two mutually-insulated wires, wherein a time domain reflection measurement instrument is connected between a second end of the first wire of the two mutually-insulated wires and a second end of the second wire of the two mutually-insulated wires, and wherein a helix pitch of the spiral structure is configured to change in response to the rock-soil deformation.