MAGNETIC SCANNING APPARATUS

摘要

Magnetic scanning apparatus including means for generating an excitation magnetic field (1) in a region in which a specimen to be scanned may be placed, a detector (3) for detecting a magnetic field originating from or modified by a specimen being scanned and a sheet of magnetic material (2) to nullify the excitation field in the region of the detector (3). The means for generating the excitation field 1 may be an array of permanent magnets 6(6). The detector (3) may be an array of galvomagnetic devices such as Hall Effect devices. A display (5) may be included in the detector. The display may include a number of pixels, one for each of the galvomagnetic devices of the detector (3).