发明名称 |
DUCT TESTING |
摘要 |
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 or blowability within the duct. |
申请公布号 |
EP0300647(B1) |
申请公布日期 |
1993.09.15 |
申请号 |
EP19880306225 |
申请日期 |
1988.07.07 |
申请人 |
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY |
发明人 |
JENKINS, PETER DAVID;WILTSHIRE, BRUCE |
分类号 |
G01M3/24;F17D5/02;G01M3/00;G01M3/26;G01M3/28;H01L23/31 |
主分类号 |
G01M3/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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