Series of Portable Structuroscope-Instruments Based on Measuringthe CoerciveForce

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.…”

“…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.…”

“…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.…”

Application of coercimetry to assess the functional properties of materials

“…Nowadays, the most common method for local measurement of the coercive force is the method proposed back in the middle of the last century [1,2], based on magnetizing until saturation of a section of a ferromagnetic object using a U-shaped bipolar electromagnet, which forms a closed magnetic circuit with the tested object, followed by demagnetization and measurements of the demagnetizing current in the coils of the electromagnet, leading to zero flux in this circuit [3][4][5][6][7][8][9][10][11]. This demagnetizing current c I is proportional to the average value of the coercive force of the magnetized (tested) volume of the tested object.…”

“…From theoretical and experimental data, it follows that the measuring capabilities and readings of coercimeters with the measurement of the demagnetizing current are influenced by the size and shape of the tested objects [1][2][3][4][5][6][7][8][9][10][11][12], the size and shape of the attached electromagnets used [2,[3][4][5][10][11][12], the presence and the size of the gaps in the magnetic circuit "attached transducer -object", the degree of homogeneity of properties in the magnetized volume, the type and characteristics of the zero-indicator of magnetic flux in the circuit "attached transducer -object" [6][7][8][11][12][13]. Coercimeters, in which the procedure of the measurement of demagnetizing current(DC) is used(DC-coercimeters) have become very widespread.…”