Fiber sensor based on fusion of peanut-shaped structures and fiber Bragg grating (FBG)

The utility model relates to a fiber sensor based on fusion of peanut-shaped structures and a fiber Bragg grating. The fiber sensor comprises a broadband light source, moving platforms, a sensing head and a spectrometer. A single-mode fiber with the fiber Bragg grating engraved is welded between two fiber peanut-shaped structures to form the sensing head of the sensor. The sensing head is fixed between the two moving platforms. One end of the sensing head is connected with the broadband light source while the other end is connected with the spectrometer. The transmission spectrum of the sensing head changes with the external curvature and temperature changes. By measuring the changes of a resonance peak in the transmission spectrum, sensing information can be calculated and acquired according to corresponding formulas. Furthermore, the fiber sensor which is simple and portable is convenient and practical.