| 摘要 |
<p>A pair of cores (2, 3) is arranged so that their respective first end portions (2a, 3a) are opposed to each other across a given gap (G) with a transfer path (M) for the passage of a medium (10) between them. Coils (4a, 4b) wound individually on the respective first end portions of the cores are connected in series with each other to form a first coil (100). Coils (5a and 5b) wound individually on second end portions (2b, 3b) of the cores are connected in series with each other to form a second coil (200). Coils (6, 7) wound individually on respective intermediate portions of the cores are connected in series with each other to form a third coil (300). A signal processing circuit is provided for AC-energizing the third coil to process a detection signal from the first coil and a detection signal from the second coil.</p> |
