Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1982-12-13
1985-10-08
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324346, 33178F, G01N 2772, G01B 712
Patent
active
045463140
ABSTRACT:
A method and apparatus is disclosed for electrically measuring the inside diameter of a metallic pipe such as oil or gas well casing. The transimpedance of two coaxial coils within the pipe is determined and then resolved into its inphase and quadrature components. The difference of the magnitudes of the two components, .DELTA.Z, is approximated by a function independent of the electrical properties of the pipe but which is a function of the inside diameter of the pipe. The inside diameter is determined from the function in response to the measured .DELTA.Z and may be recorded as a function of travel distance in the pipe.
REFERENCES:
patent: 2992390 (1961-07-01), de Witte
patent: 3051892 (1962-08-01), Huston
patent: 3065407 (1962-11-01), Huddleston, Jr. et al.
patent: 3417325 (1968-12-01), McCollough et al.
patent: 3940689 (1979-02-01), Johnson, Jr.
patent: 4292588 (1981-09-01), Smith
Zaman et al., "Impedance of a Loop Surrounding a Conducting Cylinder", IEEE Transaction, Mar. 1981, pp. 41-45.
Dodd et al., "Analysis of the Eddy-Current Problem", American Society for Testing and Materials, ASTM STP 722, 1981, pp. 231-236.
McCann R. Bruce
Minerbo Gerald N.
Edmonds Warren S.
Schlumberger Technology Corp.
Strecker Gerard R.
LandOfFree
Method and apparatus for measuring the inside diameter of a meta 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 measuring the inside diameter of a meta, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring the inside diameter of a meta will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2222324