| 摘要 |
<p>PURPOSE:To easily decide a fact that an unmanned carrier gets out of its course with a course deciding signal, i.e., the output voltage of a differential amplifier obtained at presence of an object to be detected by detecting synchronously the voltage induced from a detection coil based on the exciting voltage of an exciting coil. CONSTITUTION:An exciting coil 2 generates an AC magnetic field with reception of the output of an oscillator 1, and the detection coils 3 and 13 output the induced voltage via the AC magnetic field, respectively. The synchronizing detectors 5 and 15 detect synchronously the outputs sent from the amplifiers 4 and 14 with the output of the oscillator 1. The output of a differential ampli fier 8 is identical with the differential voltage between both coils 3 and 13 and serves as a course deciding signal of an unmanned carrier. Thus, only the changing components of the induced voltage produced by both coils 3 and 13 with approximation of an object to be detected are outputted from the ampli fier 8. Then the magnetic field change is outputted at either one of right and left sides of the coils 3 and 13, respectively. Thus, it is possible to decide a fact that the carrier gets out of its course just by detecting the output voltage of the amplifier 8.</p> |
