ET05.pdf

Field projection data the field projection in space

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Field Projection Data The field projection in space is shown in Figs. 14 and 15. Figure 14a is the 140 Electromagnetic Testing F IGURE 11. Flux distribution plots for three different probes using same coil at 100 kHz: (a) air core coil; (b) coil wound on 20 mm (0.8 in.) diameter cylindrical ferrite core, 8 mm (0.3 in.) long; (c) coil inside one half of cup core made of same material. (a) (b) (c) M OVIE . Cup core probe.
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141 Probes for Electromagnetic Testing F IGURE 12. Flux distribution for three coils at liftoff of 4 mm (0.16 in.) over thick conducting materials: (a) air coil over nonmagnetic material (Unified Numbering System N06600); (b) cylindrical ferrite core probe over same nonmagnetic material; (c) cup core over same nonmagnetic material; (d) air core coil over magnetic material (carbon steel); (e) cylindrical ferrite core probe over same magnetic material; (f) cup core probe over same magnetic material. (a) (b) (c) (d) (e) (f) Core Core F IGURE 13. Flux distribution for three coils at liftoff of 1 mm (0.04 in.) over thick conducting material: (a) air core coil over nonmagnetic material (Unified Numbering System N06600); (b) cylindrical ferrite core probe over same nonmagnetic material; (c) cup core over same nonmagnetic material; (d) air core coil over magnetic material (carbon steel); (e) cylindrical ferrite core probe over same magnetic material; (f) cup core probe over same magnetic material. (a) (b) (c) (d) (e) (f) Core Core Core Core Core Core
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normalized field component for the air core coil, Fig. 14b is the normalized field component for the cylindrical ferrite core probe and Fig. 14c is the normalized component of the field for the cup core probe. For each probe, the field is plotted at seven different locations starting 142 Electromagnetic Testing F IGURE 14. Normal component of magnetic field at seven axial locations below probe surface 0.5 mm to 125 mm (0.02 to 5.0 in.) axial distance: (a) air core coil probe; (b) cylindrical ferrite core probe; (c) cup core probe. (a) (b) (c) Normalized flux density B Y 1.0 0.75 0.5 0.25 0 –0.25 –0.5 –0.75 –1.0 1 2 3 4 5 6 7 –56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Normalized flux density B Y 1 2 3 4 5 6 7 56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Normalized flux density B Y 1.0 0.75 0.5 0.25 0 –0.25 –0.5 –0.75 –1.0 1 2 3 4 5 6 7 56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Legend 1. 0.5 mm (0.02 in.). 2. 2 mm (0.08 in.). 3. 5 mm (0.20 in.). 4. 10 mm (0.40 in.). 5. 20 mm (0.80 in.). 6. 50 mm (2.0 in.). 7. 125 mm (5.0 in.). 1.0 0.75 0.5 0.25 0 –0.25 –0.5 –0.75 –1.0 F IGURE 15. Tangential component of magnetic field at seven axial locations below probe surface: (a) air core coil probe; (b) cylindrical ferrite core probe; (c) cup core probe. Normalized tangential flux density B Z 1.0 0.75 0.5 0.25 0 –0.25 1 2 3 4 5 6 7 56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Normalized tangential flux density B Z 1.0 0.75 0.5 0.25 0 –0.25 1 2 3 4 5 6 7 –56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Normalized tangential flux density B Z 1.0 0.75 0.5 0.25 0 –0.25 1 2 3 4 5 6 7 –56.25 –37.5 –18.75 0 18.75 37.5 56.25 (–2.2) (–1.5) (–0.7) (0.7) (1.5) (2.2) Radial distance, mm (in.) Legend 1. 0.5 mm (0.02 in.).
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  • Fall '19
  • Wind, The Land, Magnetic Field, Eddy Current Probes, electromagnetic testing

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