G - Physics
01
M
73/117
G01M 3/24 (2006.01) F17D 5/02 (2006.01) G01M 3/28 (2006.01) H01L 23/31 (2006.01)
Patent
CA 1332518
A technique for detecting faults, blockages or holes, in a duct (6). A burst of compressed gas is injected into the duct and the decay of the pressure pulse monitored by a transducer at the gas burst launch end of the duct. A reference decay pressure that would be expected for a perfect duct is generated and the monitored decay is compared with the reference decay for deviation. A perforated duct exhibits greater pressure decay and a blocked duct less pressure decay than a perfect duct. The time occurrence of the deviation indicates the location of the fault. The signal level indicative of the pressure after a predetermined interval may also be used to measure the air friction of blowability within the duct.
571242
Jenkins Peter David
Wiltshire Bruce
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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