| 摘要 |
<p>PURPOSE:To accurately detect metallic foreign matters erroneously mixed in foodstuffs contained in plastic containers having oxygen absorbing functions. CONSTITUTION:An inspecting device which inspects an object to be inspected for metallic foreign matters by detecting magnetic flux variation caused by the object to be inspected in a magnetic field generated by means of alternating magnetic field generating means 1 and P with detecting means Sa, Sb, and 2 is constituted of a detecting means 3 which fetches magnetic component signals from detected signals, modulating means 5 which modulates the detecting signals of the means 3 at the same frequency as that of the alternating voltage from the alternating voltage generating means 1, magnetic component signal removing means provided with a subtractor 7 which subtracts the output signal of the means 5 from the detected signals, detector 9 which detects a conductor component signal outputted from the removing means, and discriminator which discriminates the presence/absence of a metal mixed in the object to be inspected based on the output of the detector 9.</p> |
