MAN'S ACCESS DETECTOR

摘要

PURPOSE:To detect a man's access accurately, by providing a magnetism detecting means within a magnetism shielding space to detect magnetism emanated from a man. CONSTITUTION:A superconductive magnetism detector 7 and a magnetism judging device 10 are provided within a space 3 for shielding an external magnetism 1. When a man 5 approaches the superconductive magnetism detector 7, the detector 7 inputs an output thereof into the magnetism judging device 10. The magnetism judging device 10 detects the magnetism detected exceeding a specified value in a specified frequency using a band pass filter 8 and a comparator 9 to judge that said magnetism comes from the man 5. This enables more accurate detection of a man's access.