A flexible optic fiber sensor film, a mat structure comprising the same and a method of use of the mat structure are provided. The flexible optic fiber sensor film (113) comprises a sandwiched layer (114) and an optic fiber cable (115) arranged in the sandwiched layer (114) the flexible optic fiber sensor film (113) further comprises protrusions (142) arranged on the sandwiched layer (114) to abut against the optic fiber cable (115). The flexible optic fiber sensor film (113) is configured for generating light loss in the optic fiber cable (115) when there are body movements of a human subject lying on top of the flexible optic fiber sensor film (113).本發明提供了一種柔性光纖感應薄膜、包含該柔性光纖感應薄膜的墊子及其使用方法。該柔性光纖感應薄膜(113)包括一個夾層(114)和一個安裝在該夾層(114)中的光纖(115);該柔性光纖感應薄膜(113)還包括緊靠該光纖(115)安裝在該夾層(114)中的突起物。該柔性光纖感應薄膜(113)用於當有人體躺在該柔性光纖感應薄膜(113)上活動時,在該光纖(115)中產生光損耗。110‧‧‧可編程LED驅動111‧‧‧光源112‧‧‧光傳感器113‧‧‧柔性光纖感應薄膜114‧‧‧夾層115‧‧‧光纖
