Patent ID: 7856157

Claim:
A security system for an elongated tubular structure, the system comprising: a plurality of flexible sheets arranged contiguously along a longitudinal direction of the tubular structure and each configured to circumferentially wrap around an external surface of a respective section of a predetermined length of the structure, to cover the entire area of the respective section of the tubular structure, and each of the sheets having at least one signal path disposed in the sheet and extending across substantially the entire area of the sheet, the at least one signal path having a first end and a second end; the plurality of contiguous sheets covering the entire area of the predetermined length of the tubular structure; at least one signal source coupled to the first end of the at least one signal path of each of the plurality of flexible sheets; at least one detector coupled to the second end of the at least one signal path and operative to detect a signal in the signal path from the first end to the second end, and when a loss of signal is detected, output a first signal, wherein the at least one detector includes a detector for each of the sheets coupled to the at least one signal path of the respective sheet; and a circuit coupled to the at least one detector and operative to provide an alarm indication upon the occurrence of the first signal, wherein the circuit is coupled to each of the detectors and operative to provide an indication of the identity or location of the respective sheets.