| 摘要 |
In a magnetic field obtaining apparatus, a measuring part (21) that is sufficiently longer than the width of an area to be measured is disposed on a measurement plane that satisfies z=α, and scanning in an X′ direction perpendicular to the longitudinal direction of the measuring part (21) is repeated while changing an angle &thetas; formed by a predetermined reference direction on the measurement plane and the longitudinal direction of the measuring part (21) to a plurality of angles. Assuming that x′ is a coordinate parameter in the X′ direction, measured values f(x′, &thetas;) obtained by repetitions of the scanning are Fourier transformed so as to obtain g(kx′, &thetas;) (where kx′ is a wavenumber in the X′ direction). Then, g(kx′, &thetas;) is substituted into a predetermined two-dimensional potential obtaining equation so as to obtain &phgr;(x, y, α) that indicates a two-dimensional potential on the measurement plane. Accordingly, it is possible to perform high-resolution two-dimensional potential measurement as a result of using the measuring part (21) that is sufficiently larger than the width of an area to be measured. |
