| 摘要 |
This disclosure provides systems, methods and apparatus for detecting foreign objects. An apparatus for detecting a presence of an object is provided including a plurality of electrically conductive loops (701, 702, 703, 704) arranged in an array. The apparatus includes a sensor circuit (730) configured to determine a characteristic associated with each of the plurality of loops. The apparatus includes a hardware processor (734) configured to, for each loop of the plurality of loops, determine a parameter based on the characteristic associated with the loop and the characteristic associated with at least one adjacent loop. The hardware processor may be further configured to determine the presence of the object based on the parameter. The parameter may comprise a sum of a difference between the characteristic associated with the loop and a reference value for the characteristic, and a difference between the characteristic associated with each of the at least one adjacent loop and the reference value. |
