Sensor and detection system for detecting foreign matters between heat transfer tubes of steam generator of nuclear power plant

The invention discloses a sensor and a detection system for detecting foreign matters between heat transfer tubes of a steam generator of a nuclear power plant, the sensor comprises a probe assembly, a cable assembly and a connecting assembly which are connected in sequence, the probe assembly comprises a shell, and one end, far away from the cable assembly, of the shell is provided with a plurality of camera modules and a plurality of illumination modules; the shell is provided with an LIBS (laser-induced breakdown spectroscopy) probe for emitting laser and receiving a plasma spectrum generated by the excitation substance; the connecting assembly comprises an optical fiber connector and a plurality of metal wire conductors arranged around the optical fiber connector, the optical fiber connector is used for coupling an optical fiber bundle, and the metal wire conductors are used for connecting a signal line and a power supply wire. The sensor breaks through the limitation that foreign matter video inspection