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wslyr123

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A tomographic metal detection and characterisation system has been designed and built with the
intention of recovering detailed information about magnetic and/or conductive objects within the
detector space. This information is gathered as a result of a ¡°walk-through¡± scan of a candidate in the
same manner as would be expected at a typical security metal detector archway. Following the
passage of the candidate, the system uses measurements from an array of coils to calculate the
polarisability tensor, which is considered to describe the low frequency electromagnetic characteristic
of a small metallic object when it interacts with a magnetic field. The tensor is known to vary according
to the excitation frequency of the applied magnetic field, however in this system only a single
frequency measurement is considered. In addition to the magnetic polarisability dyadic tensor the
position of the perturbation is also determined as a product of the inversion algorithm.
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wslyr123: ½ð±Ò+100 2024-07-12 07:31:51
ÕÅÁ¿´Å»¯ÂÊ:  M_{i} = \chi_{ij} H_{j}
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΢·Ö´Å»¯ÂÊ: \chi_{ij} = \frac_{\part M_{i}}{\part H_{j}}
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wslyr123

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2Â¥: Originally posted by rlafite at 2024-07-10 00:15:34
ÕÅÁ¿´Å»¯ÂÊ:  M_{i} = \chi_{ij} H_{j}
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\chi_{ij} ÊǸö¶þ½×ÕÅÁ¿£¬Òò´ÎΪ (3,3) £¬ÃèÊöÒòΪÍâ´Å³¡Ê©¼ÓÓÚ j ·½Ïò£¬¶ø ...

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