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Title: Eddy current measurement of tube element spacing

A method of electromagnetically measuring the distance between adjacent tube elements in a heat exchanger. A cylindrical, high magnetic permeability ferrite slug is placed in the tube adjacent the spacing to be measured. A bobbin or annular coil type probe operated in the absolute mode is inserted into a second tube adjacent the spacing to be measured. From prior calibrations on the response of the eddy current coil, the signals from the coil, when sensing the presence of the ferrite slug, are used to determine the spacing between the tubes.
Authors:
 [1] ;  [2] ;  [3]
  1. (Forest, VA)
  2. (Lynchburg, VA)
  3. (Madison Heights, VA)
Publication Date:
OSTI Identifier:
871510
Report Number(s):
US 5744952
DOE Contract Number:
AC11-95PN38196
Resource Type:
Patent
Research Org:
BABCOCK & WILCOX CO
Country of Publication:
United States
Language:
English
Subject:
eddy; current; measurement; tube; element; spacing; method; electromagnetically; measuring; distance; adjacent; tube; elements; heat; exchanger; cylindrical; magnetic; permeability; ferrite; slug; placed; tube; adjacent; spacing; measured; bobbin; annular; coil; type; probe; operated; absolute; mode; inserted; tube; adjacent; spacing; measured; prior; calibrations; response; eddy; current; coil; signals; coil; sensing; presence; ferrite; slug; determine; spacing; tubes; current measurement; magnetic permeability; tube adjacent; tube adjacent; eddy current; eddy current; heat exchange; heat exchanger; adjacent tube; current coil; element spacing; tube element; tube element /324/165/