AU2005242181B2 - Usage of air pulse techniques within pipelines as applied to securing assets against unauthorised access - Google Patents

Abstract

Abstract That monitoring for an interruption or disturbance of regularly generated 0.1Hz. to 5 Hz air impulses traveling in a 3mm to 25mm diameter pipeline, placed around or near equipment or property boundaries, can be used as a method to secure said property or equipment against unauthorized access.

Description

Page 1 of 2 Pages Air Pulse security Specification Document Invention Title: Usage of air pulse techniques within pipelines as applied to securing assets against unauthorized access The invention is described in the following statement: Where equipment or property boundaries must be protected against unauthorised access, a pipeline barrier, typically 5 to 25mm in diameter, is established along a boundary or part boundary to be protected. This boundary perimeter may be as little as a few metres long , or in incremental steps of up to 1500 metres, depending upon the size of the equipment boundary or land parcel to be protected. Air impulses of typically 1 to 10 cubic centimetres, delivered within brief 50 to 500 millisecond bursts, are injected into one end of a flexible or semi-flexible pipeline via an electrically powered diaphragm. These bursts are delivered at frequent intervals of typically 0.2 to 10 seconds. While this interval is not critical to operation, more frequent pulse transmissions provide greater security and less frequent pulse transmissions consumes less power. At the opposite end of the pipeline an Air Impulse receiver stage monitors all air movements within the pipeline for rapid changes. Once a measurement profile of valid air impulses through the pipeline is established (by taking an average of the frequency and magnitude of the last five to ten pulses received), the receiver then tests for interruptions or variations to these pulses, Where the air pulse profile received is interrupted or varied in intensity by five percent or more, an unauthorized intrusion event is deemed to have occurred and an alarm condition will be relayed to security staff or event recording equipment. This process essentially means that an air pipeline attached to a fence on a property boundary is being used to prevent unauthorised access or theft of livestock and equipment. by sounding an alarm if the air line is momentarily bent, pierced or broken or moved. The same system placed on or around plant and equipment can be used to trigger an alarm condition if this equipment is moved by unauthorised persons.