Automobile engine knock sensor based on fiber grating array and vehicle

The utility model discloses an automobile engine knock sensor based on a fiber bragg grating array, belongs to the technical field of fiber sensing and engine knock monitoring, and aims to solve the problem that an electronic sensor adopted by an existing knock sensor is easily interfered by electromagnetic interference, so that the measurement is inaccurate. The device comprises a shell, a rhombic-structure elastomer, a fiber grating, an upper mass block and a lower mass block, the upper mass block is arranged at the upper end of an inner cavity of the shell, the lower mass block is arranged at an opening in the lower end of the shell, and the two ends of the vertical diagonal line of the rhombic-structure elastomer are fixedly embedded in the upper mass block and the lower mass block respectively; the horizontal diagonal line of the rhombic structure elastomer clamps the fiber bragg grating, the tail end of the fiber bragg grating extends out of the shell, and the tail end of the fiber bragg grating is prov