Abstract: Seat-occupancy-detection-sensor-element featuring double-body/compression/spring (DBCS) in a recess of a base-member (BM); and slidable-member (SM) having a force-application-side (FAS) and inside facing the BM; measuring-coil (MC) arranged in the recess and surrounded by the DBCS and having wound-coil-wire (WCW); and current-generating/measuring/evaluating-unit (CGMEU) connected to the WCW; the DBCW abutting the BM on one side and being fixed to the SM on the side of the SM compressed by a force on the FAS, from a spring length either uncompressed or compressed by a predetermined extent; spring wire ends connected and electrically forming a spring-coil (SC); MC and SC coils constituting an inductively-coupled coil assembly (ICCA); and the CGMEU applying AC to the MC inducing AC in the DBCS, measuring voltage on the MC proportional to the ICCA's impedance, and ascertaining force on the SM's FAS.

Abstract: Seat-occupancy-detection-sensor-element featuring double-body/compression/spring (DBCS) in a recess of a base-member (BM); and slidable-member (SM) having a force-application-side (FAS) and inside facing the BM; measuring-coil (MC) arranged in the recess and surrounded by the DBCS and having wound-coil-wire (WCW); and current-generating/measuring/evaluating-unit (CGMEU) connected to the WCW; the DBCW abutting the BM on one side and being fixed to the SM on the side of the SM compressed by a force on the FAS, from a spring length either uncompressed or compressed by a predetermined extent; spring wire ends connected and electrically forming a spring-coil (SC); MC and SC coils constituting an inductively-coupled coil assembly (ICCA); and the CGMEU applying AC to the MC inducing AC in the DBCS, measuring voltage on the MC proportional to the ICCA's impedance, and ascertaining force on the SM's FAS.