| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a detection device and a program capable of preventing erroneous detection due to noise. <P>SOLUTION: A detection device includes an exciting coil 11 adapted to generate an alternating magnetic field in a region to be a detection object, and detection coils 12, 13 to which electric signals in accordance with the alternating magnetic field generated by the exciting coil 11 are induced. While a main amplifier 32 amplifies a third electric signal obtained from a difference between a first electric signal which is induced to the detection coils 12, 13 in the state where a tag as a magnetic body to be a detection object exists in the region to be the detection object and a second electric signal which is induced to the detection coils 12, 13 in the state where the tag does not exist in the region to be the detection object, a controller 22 detects the tag passing through the region to be the detection object by detecting magnetic field change due to magnetization reversal of the tag based on the third electric signal amplified by the main amplifier 32. <P>COPYRIGHT: (C)2012,JPO&INPIT |
