Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Reissue Patent
2004-07-28
2008-09-23
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
C324S240000, C073S623000, C073S643000
Reissue Patent
active
RE040515
ABSTRACT:
A method and system for implementing magnetostrictive sensor techniques for the nondestructive evaluation of pipeline structures. The system consists of a magnetostrictive sensor instrument unit, a data storage unit, and a plurality of magnetostrictive sensor probes are positioned on an in-line inspection vehicle. The instrumentation unit includes electronics for transmitting excitation pulses to a transmitting magnetostrictive sensor probe as well as electronics for amplifying and conditioning the signals detected by a receiving magnetostrictive sensor probe. The magnetostrictive sensor probes include both plate magnetostrictive sensors and permanent magnets which provide a DC bias magnetic field necessary for magnetostrictive sensor operation. The transmitting and receiving probes are attached to the in-line inspection vehicle by way of mechanical arms on opposing sides of the vehicle. The mechanical arms are spring loaded and are equipped with rollers which maintain the probes at approximately constant distances from the inside diameter of the pipe wall. The method involves generating pulses of shear horizontal waves of frequencies less than 200 kHz. The transmitting magnetostrictive sensor probe generates a wave that propagates in both directions around the circumference of the pipe wall from a point adjacent to the transmitting probe. Both waves are thereafter received at the receiving probe spaced 180 degrees apart from the transmitting probe. Any defect present in the pipe wall within the circumference being investigated will show up in the received signal.
REFERENCES:
patent: 4055990 (1977-11-01), Topping
patent: 4127035 (1978-11-01), Vasile
patent: 4439730 (1984-03-01), Kaufman
patent: 4769598 (1988-09-01), Krieg et al.
patent: 4945306 (1990-07-01), Lowther
patent: 5454276 (1995-10-01), Wernicke
patent: 5456113 (1995-10-01), Kwun et al.
patent: 5457994 (1995-10-01), Kwun et al.
patent: 5581037 (1996-12-01), Kwun et al.
patent: 5675251 (1997-10-01), MacLean et al.
patent: 5864232 (1999-01-01), Laursen
patent: 5907100 (1999-05-01), Cook
patent: 6023986 (2000-02-01), Smith et al.
patent: 6205859 (2001-03-01), Kwun et al.
patent: 0 304 053 (1989-02-01), None
patent: 0 389 877 (1990-10-01), None
Kim Sang Young
Kwun Hegeon
Aurora Reena
Gunn & Lee PC
Southwest Research Institute
LandOfFree
Method and apparatus for inspecting pipelines from an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for inspecting pipelines from an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for inspecting pipelines from an... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3990884