Blown installation of optical fibres and method and apparatus for determining the length of a passage along which an optical fibre is to be blown

  • US 20040231401A1
  • Filed: 05/20/2004
  • Published: 11/25/2004
  • Est. Priority Date: 05/21/2003
  • Status: Active Grant
First Claim
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1. A method of determining a length Lt at least representative of the length of a tube that defines a passage in an optical fibre cable along which an optical fibre unit can be installed by blowing, said method comprising the steps of providing a first volume V1 containing a gas at a first pressure P1, releasing said gas into a second volume V2 that comprises said passage, determining a second gas pressure P2 in said second volume V2 after release of said gas from said first volume, determining said second volume V2 by reference to said first pressure P1, second pressure P2 and said first volume V1 and determining said length Lt by reference to said second volume V2.

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