A detecting unit is presented. The detecting unit includes a flexible circuit having a first side and a second side opposite the first side. The flexible circuit includes a plurality of cells defined therein, each of the plurality of cells having a first side and a second side respectively corresponding to the first side and the second side of the flexible circuit. Moreover, the flexible circuit includes a plurality of conductive windings disposed on at least one of the first and second sides of the plurality of cells. Further, the flexible circuit includes a stress reduction feature between each of the plurality of cells. Also, the detecting unit includes a sealing element configured to secure the flexible circuit in a stacked configuration. A sensing system and a method of making a detecting unit are also presented.