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 7,207,208 B2
  • Filed: 05/20/2004
  • Issued: 04/24/2007
  • Est. Priority Date: 05/21/2003
  • Status: Expired due to Fees
First Claim
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1. A method of determining a length L1 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 a tube that defines a passage in an optical fibre cable, 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, said second pressure P2 and said first volume V1 and determining said length L1 by reference to said second volume V2.

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