投影法を用いた磁界の可視化 : その原理  [in Japanese] Principle of Visualization of Mganetic Field by the Projection Method  [in Japanese]

A method of visualizing two dimensional magnetic flux density has been presented. This method is realized through the use of an integrated search coils; that is, m arrayed search coils with n small coils serially connected are arranged with a Δθ pitch in the r-θ plane. The output voltage of these coils is used to reconstruct the objective flux distribution numerically. This is based on the projection method, which is used in the computed tomography (CT). At first, the basic principle is explained for a unit coil composed of n coils, and a scheme for reconstructing the flux distribution by means of Fourier transformation is shown. To confirm this method, a simple examination was performed experimentally, and the resolution of the reconstructed distribution was tested by using two filter functions.