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Title: Magnetic detection of underground pipe using timed-release marking droplets

A system and method are disclosed of detecting an underground pipe by injecting magnetic marking droplets into the underground pipe which coat the inside of the pipe and may be detected from aboveground by a magnetometer. The droplets include a non-adhesive cover which allows free flow through the pipe, with the cover being ablatable for the timed-release of a central core containing magnetic particles which adhere to the inside of the pipe and are detectable from aboveground. The rate of ablation of the droplet covers is selectively variable to control a free flowing incubation zone for the droplets and a subsequent deposition zone in which the magnetic particles are released for coating the pipe. 6 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
415743
Assignee:
Associated Universities, Inc., Washington, DC (United States) PTO; SCA: 440800; PA: EDB-97:016261; SN: 97001714604
Patent Number(s):
US 5,585,725/A/
Application Number:
PAN: 8-421,567
Contract Number:
AC02-76CH00016
Resource Relation:
Other Information: PBD: 17 Dec 1996
Research Org:
Associated Universities Inc
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MAGNETOMETERS; DESIGN; PIPES; DETECTION; MAGNETIC SURVEYS; SITE CHARACTERIZATION

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