Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-10-13
1990-08-14
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
324533, 324535, 324642, 324668, 73 493, G01V 138
Patent
active
049490761
ABSTRACT:
A system for leak detection in underwater structures wherein each critical leakage test point is maintained dry by an enclosure and a test cable is led down through the series of enclosures in fluid-tight manner to support a test probe within the dry test point volume. The test cable is a coaxial cable of selected characteristic impedance and each probe consists of a spirally wound, open-end dual pair supported on a plastic stub so as to constitute a parallel resonant circuit at a selected frequency. Thereafter, a test pulse is conducted down the coaxial cable and the impedance of any probe will be altered by the presence of water to produce a reflected pulse back up the coaxial cable to be detected and input to gating and counting circuitry to determine signal travel duration and, therefore, distance along the cable, as processing, printing and readout components provide output indications.
REFERENCES:
patent: 3424002 (1969-01-01), Johnson
patent: 3981181 (1976-09-01), Ochiai
patent: 4043180 (1977-08-01), Morris et al.
patent: 4468609 (1984-08-01), Schmidt
patent: 4480251 (1984-10-01), McNaughton et al.
patent: 4695787 (1987-09-01), Billet et al.
Conoco Inc.
Jackson Jill
Orsino Joseph A.
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