Distributed optical fiber sensor and system

The invention relates to the technical field of optical fiber sensors, in particular to a distributed optical fiber sensor and system.The distributed optical fiber sensor comprises a mounting box, an optical fiber sensor body, an electric push rod, a support, a motor, fan blades, a dustproof net and a filter screen; the motor drives the fan blades to rotate, external air enters the mounting box through the filter screen, and meanwhile, hot air in the mounting box is discharged through the dustproof net, so that the optical fiber sensor body can be blown and cooled, the electric push rod drives the bracket to longitudinally reciprocate, and the bracket drives the motor and the fan blades to longitudinally reciprocate; therefore, the coverage range of airflow blown out by the fan blades can be enlarged, hot air in the mounting box can be completely discharged, the heat dissipation effect is improved, and the optical fiber sensor body can be prevented from being damaged due to too high temperature after long-tim