Arc light acquisition sensor having self-check function and used for arc light protection apparatus

The invention discloses an arc light acquisition sensor having a self-check function and used for an arc light protection apparatus. The arc light acquisition sensor comprises a probe, a housing, a dual-fiber joint and a reflection device. The probe sleeves the front end of the housing. The tail end of the housing is provided with the dual-fiber joint. The reflection device is arranged in the housing. The dual-fiber joint is used for connecting two fibers arranged side by side, and the two parallel fibers are a self-check fiber and an acquisition fiber. The reflection device enables self-check light beams transmitted from the self-check fiber to be reflected to enter the acquisition fiber, so that the self-check light beams become acquisition light beams. Two reflectors with different angles in the housing are utilized by the fiber acquisition sensor to carry out effective total reflection, so that real-time monitoring of a closed beam loop can be conducted. Moreover, external arc light can be effectively acq