The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors
Само за регистроване кориснике
1997
Чланак у часопису (Објављена верзија)
,
AIP Publishing
Метаподаци
Приказ свих података о документуАпстракт
A novel, very simple, eddy current method for measuring the electrical conductivity of nonferromagnetic conductors is described. This method is relative, i.e., we measure the ratio of conductivities of two samples of the same shape and size (this shape and size may be arbitrary). For one of them, conductivity is known, this is the reference sample, whereas the conductivity of the other is unknown and it is to be determined. Consequently, in this method it is necessary to have a reference sample of known conductivity. On the other hand, in this method no other calibration is necessary; the ratio of two conductivities we obtain directly as the ratio of two frequencies, without any calibration. The principle of this method is as follows: It turns out, based on Maxwell’s equations, that if we have a coil through which a sinusoidal current of an angular frequency ω flows and in whose magnetic field a given conductive, nonferromagnetic sample is placed, the effective inductance (i.e., the ra...tio of the reactive part of the impedance to the frequency ω) depends on ω and on the conductivity of the sample σ only through their product ωσ. Therefore, if it is found that with a sample of conductivity σ 1 at frequency ω1 the effective inductance is equal to that of a sample with conductivity σ 2 and frequency ω2 (the samples being of the same shape and size, both nonferromagnetic, and both placed in the same position relative to the coil), this means that equality ω1σ1=ω2σ2 is valid. Hence, if σ1 is known and σ2 is unknown, σ2 can be calculated.
Кључне речи:
electrical conductivity / nonferromagnetic conductorsИзвор:
Review of Scientific Instruments, 1997, 68, 9, 3523-3527Издавач:
- AIP Publishing
Институција/група
IHTMTY - JOUR AU - Miletić, Milan B. AU - Nikolić, Pantelija M. AU - Vasiljević-Radović, Dana AU - Bojičić, Aleksandar I. PY - 1997 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/7480 AB - A novel, very simple, eddy current method for measuring the electrical conductivity of nonferromagnetic conductors is described. This method is relative, i.e., we measure the ratio of conductivities of two samples of the same shape and size (this shape and size may be arbitrary). For one of them, conductivity is known, this is the reference sample, whereas the conductivity of the other is unknown and it is to be determined. Consequently, in this method it is necessary to have a reference sample of known conductivity. On the other hand, in this method no other calibration is necessary; the ratio of two conductivities we obtain directly as the ratio of two frequencies, without any calibration. The principle of this method is as follows: It turns out, based on Maxwell’s equations, that if we have a coil through which a sinusoidal current of an angular frequency ω flows and in whose magnetic field a given conductive, nonferromagnetic sample is placed, the effective inductance (i.e., the ratio of the reactive part of the impedance to the frequency ω) depends on ω and on the conductivity of the sample σ only through their product ωσ. Therefore, if it is found that with a sample of conductivity σ 1 at frequency ω1 the effective inductance is equal to that of a sample with conductivity σ 2 and frequency ω2 (the samples being of the same shape and size, both nonferromagnetic, and both placed in the same position relative to the coil), this means that equality ω1σ1=ω2σ2 is valid. Hence, if σ1 is known and σ2 is unknown, σ2 can be calculated. PB - AIP Publishing T2 - Review of Scientific Instruments T1 - The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors VL - 68 IS - 9 SP - 3523 EP - 3527 DO - 10.1063/1.1148317 ER -
@article{ author = "Miletić, Milan B. and Nikolić, Pantelija M. and Vasiljević-Radović, Dana and Bojičić, Aleksandar I.", year = "1997", abstract = "A novel, very simple, eddy current method for measuring the electrical conductivity of nonferromagnetic conductors is described. This method is relative, i.e., we measure the ratio of conductivities of two samples of the same shape and size (this shape and size may be arbitrary). For one of them, conductivity is known, this is the reference sample, whereas the conductivity of the other is unknown and it is to be determined. Consequently, in this method it is necessary to have a reference sample of known conductivity. On the other hand, in this method no other calibration is necessary; the ratio of two conductivities we obtain directly as the ratio of two frequencies, without any calibration. The principle of this method is as follows: It turns out, based on Maxwell’s equations, that if we have a coil through which a sinusoidal current of an angular frequency ω flows and in whose magnetic field a given conductive, nonferromagnetic sample is placed, the effective inductance (i.e., the ratio of the reactive part of the impedance to the frequency ω) depends on ω and on the conductivity of the sample σ only through their product ωσ. Therefore, if it is found that with a sample of conductivity σ 1 at frequency ω1 the effective inductance is equal to that of a sample with conductivity σ 2 and frequency ω2 (the samples being of the same shape and size, both nonferromagnetic, and both placed in the same position relative to the coil), this means that equality ω1σ1=ω2σ2 is valid. Hence, if σ1 is known and σ2 is unknown, σ2 can be calculated.", publisher = "AIP Publishing", journal = "Review of Scientific Instruments", title = "The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors", volume = "68", number = "9", pages = "3523-3527", doi = "10.1063/1.1148317" }
Miletić, M. B., Nikolić, P. M., Vasiljević-Radović, D.,& Bojičić, A. I.. (1997). The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors. in Review of Scientific Instruments AIP Publishing., 68(9), 3523-3527. https://doi.org/10.1063/1.1148317
Miletić MB, Nikolić PM, Vasiljević-Radović D, Bojičić AI. The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors. in Review of Scientific Instruments. 1997;68(9):3523-3527. doi:10.1063/1.1148317 .
Miletić, Milan B., Nikolić, Pantelija M., Vasiljević-Radović, Dana, Bojičić, Aleksandar I., "The ωσ method: A new contactless comparison method for measuring electrical conductivity of nonferromagnetic conductors" in Review of Scientific Instruments, 68, no. 9 (1997):3523-3527, https://doi.org/10.1063/1.1148317 . .