Sensor system for sensing a weft thread that is being inserted in the weft insertion direction (D), in at least a first zone (Z1); the sensor system comprising: a plurality of light emitters comprising at least a first and a second light emitter configured for emitting light (L1, L2) in the first zone (Z1) where the weft thread needs to be detected; wherein the first light emitter and the second light emitter are located at a distance from each other, seen in the weft insertion direction (D); one or more light receivers comprising a first light receiver configured for receiving light from the first and the second light emitter which has been reflected by the weft thread in the first zone (Z1); wherein the first light receiver is located, seen in the weft insertion direction (D), between the first light emitter and the second light emitter ; characterized in that the second light emitter is further configured for emitting light in a second zone (Z2) where the weft thread needs to be detected, the second zone (Z2) is located downstream of the first zone (Z1), seen in the weft insertion direction (D); wherein the plurality of light emitters comprises a third light emitter configured for emitting light in the second zone (Z2); wherein the second light emitter and the third light emitter are located at a distance from each other, seen in the weft insertion direction (D); wherein the one or more light receivers comprise a second light receiver configured for receiving light from the second and the third light emitter which has been reflected by the weft thread in the second zone (Z2); wherein the second light receiver is located, seen in the weft insertion direction (D), between the second light emitter and the third light emitter . a plurality of light emitters comprising at least a first and a second light emitter configured for emitting light (L1, L2) in the first zone (Z1) where the weft thread needs to be detected; wherein the first light emitter and the second light emitter are located at a distance from each other, seen in the weft insertion direction (D); one or more light receivers comprising a first light receiver configured for receiving light from the first and the second light emitter which has been reflected by the weft thread in the first zone (Z1); wherein the first light receiver is located, seen in the weft insertion direction (D), between the first light emitter and the second light emitter ; characterized in that the second light emitter is further configured for emitting light in a second zone (Z2) where the weft thread needs to be detected, the second zone (Z2) is located downstream of the first zone (Z1), seen in the weft insertion direction (D); wherein the plurality of light emitters comprises a third light emitter configured for emitting light in the second zone (Z2); wherein the second light emitter and the third light emitter are located at a distance from each other, seen in the weft insertion direction (D); wherein the one or more light receivers comprise a second light receiver configured for receiving light from the second and the third light emitter which has been reflected by the weft thread in the second zone (Z2); wherein the second light receiver is located, seen in the weft insertion direction (D), between the second light emitter and the third light emitter . <EOS>