Coercive force measurements in nondestructive testing

The topography of the field and flux inside and above the surfaces of ferromagnetic plates during their contact and contactless magnetization

“…It should be noted that at present, transducers with X 0 > Y 0 are most frequently used in coercimetry [1][2][3][4][5][6]. The typical dimensions of electromagnets (pole cross section, interpole distance) are as follows: 4 × 10 mm, 15 mm; 5 × 15 mm, 25 mm; and 12 × 28 mm, 32 mm.…”

“…A U shaped electromagnet with a magnetic flux sensor, which is built into it, usually serves as the measuring transducer. A loop flux gate [1, 2] or a Hall probe, which is placed in the magnet gap (e.g., КИФМ 1Х and КИМ 2М соеrcimeters) [1][2][3][4] or located near the magnetic core and registers the leakage flux [1,5], can be used as the magnetic flux sensor. In the case of a loop flux gate or a Hall probe near a magnetic circuit, the transducer-object combined circuit remains closed, but as a result of a nonlinear and ambiguous dependence of readings of such transducers on the flux value, they can be used only as null indicators.…”

“…Local measurements of magnetic parameters are most fre quently performed using attachable transducers. Coercimeters [1][2][3][4][5][6] and magnetic structuroscopes [7][8][9] are examples of such testing tools. A U shaped electromagnet with a magnetic flux sensor, which is built into it, usually serves as the measuring transducer.…”

Investigation of applicability of extrapolation method for sample field determination in single-yoke measuring setup

“…Due to its simplicity and economical feasibility the magnetic hysteresis technique is considered to be an attractive method for this task. However, despite of the long history of the investigation, there is still no cheap, simple and stable measurement technique in use for evaluation of magnetically open samples (see reviews [1,2]). …”

Certification of hardened surface layers by magnetic and electromagnetic methods

“…To control the quality of the carburization machine-building enterprises have long employed coercive force meters of type KIFM with attached electromagnets, the experience of the operation with which is generalized in [8,9]. For simultaneous control of the thickness and hardness of quenched carburized layers on parts of drill bits from steels 17KhN2 and 20KhN3A, plunger blades from steel 20, and many other parts it is sufficient to use only one attached electromagnet.…”