| 摘要 |
<p>A sensor that measures a difference of currents at two locations along a conductor. The sensor uses two fiber optic current sensors. One current sensor at the first location measures current and has a nulling coil about its sensing loop, which carries current to null out the reading of current. Another current sensor at the second location measures current and also has a nulling coil about its sensing loop. The nulling coil of the latter sensor has the same current as the nulling coil of the sensor at the first location. For similar current sensors sensing the same magnitudes of current at their respective locations will have their outputs nulled to zero. However, if the first sensor output is nulled out and the sensor at the second location is sensing a different amount of current than the sensor at the first location, with the same amount of current in its nulling coil, then the output of the second sensor will indicate the difference of currents at the two locations, thereby indicating a loss or a gain of current along theconductor.</p> |
