Electromagnetic testing emt-mft chapter 9b

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Fig. 4 Leakage flux and search coil signal as a function of position. Charlie Chong/ Fion Zhang
Unlike the inductive coil, which provides a measure of the flux gradient, a Hall effect sensor directly measures the component of the flux itself in the direction perpendicular to the sensitive area of the device. Because the response of a Hall effect sensor does not depend on the motion of the probe, it can be scanned over the surface to be inspected at any rate that is mechanically convenient. In this respect, the Hall device has an advantage over the coil sensor because there is no need to maintain a constant scanning speed during the inspection. On the other hand, Hall effect sensors are more difficult to fabricate, are somewhat delicate compared to inductive coil sensors, and require more complex electronics. Other magnetic field sensors that are used less often in leakage field applications include the flux gate magnetometer, magnetoresistive sensors, magnetic resonance sensors, and magnetographic sensors, in which the magnetic field at the surface of a part is registered on a magnetic tape pressed onto the surface. Keywords: Hall device has an advantage over the coil sensor because there is no need to maintain a constant scanning speed during the inspection. Charlie Chong/ Fion Zhang
Page 1 and 2: Electromagnetic Testing MFLT/ ECT/
Page 3 and 4: Ship building Charlie Chong/ Fion Z
Page 5 and 6: Offshore Structures & Appurtenances
Page 13 and 14: Power Piping Charlie Chong/ Fion Zh
Page 15 and 16: Charlie Chong/ Fion Zhang
Page 17 and 18: Fion Zhang at Shanghai 2015 Februar
Page 19 and 20: Chapter 9B: Magnetic Field Testing
Page 21 and 22: Keywords: Field of magnetic materia
Page 23 and 24: Although it is conceivable that lea
Page 25 and 26: Barkhausen noise: Magnetization (J)
Page 27 and 28: Barkhausen noise A coil of wire wou
Page 29 and 30: A set-up for non-destructive testin
Page 31 and 32: Magnetic Dipole Charlie Chong/ Fion
Page 33 and 34: If a slot is cut in the rod, as ill
Page 35 and 36: 2.2 Experimental Techniques. One of
Page 37 and 38: It is possible to generate a magnet
Page 39 and 40: The flaw leakage field can be detec
Page 41: Fig. 3 Flux leakage measurement usi
Page 45 and 46: There are, however, many situations
Page 47 and 48: Fig. 5 Dependence of magnetic signa
Page 49 and 50: Fig. 6 Characterization of a ferrit
Page 51 and 52: PART 2. Principles of Magnetic Char
Page 53 and 54: Hysteresis Curves Charlie Chong/ Fi
Page 55 and 56: Nevertheless, the prospect of nonde
Page 57 and 58: Curie temperature Below T c Ferroma
Page 59 and 60: Paramagnetism The magnetic moments
Page 61 and 62: Antiferromagnetism The magnetic mom
Page 63 and 64: Fig. 7 Experimental arrangement for
Page 65 and 66: The review articles and conference
Page 67 and 68: Leakage field sensors are mounted b
Page 69 and 70: In addition to systems for inspecti
Page 71 and 72: The flux leakage method is also fin
Page 73 and 74: Another area in which the flux leak
Page 75 and 76: Finally, the flux leakage method ha
Page 77 and 78: Steel rebars and cables in a large
Page 79 and 80: Fig. 10 Effect of mechanical hardne
Page 81 and 82: Keywords: • For one alloy, AISI 4
Page 83 and 84: Offshore Structures Charlie Chong/
Page 85 and 86: VLCC Charlie Chong/ Fion Zhang
Page 87 and 88: Offshore Structures Charlie Chong/
Page 89 and 90: Pipeline & Piping Charlie Chong/ Fi
Page 91 and 92: Charlie Chong/ Fion Zhang

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