Novel [phi]-OTDR detection device based on fixed reflection points and detection method thereof

The invention discloses a novel [phi]-OTDR detection device based on fixed reflection points. The novel [phi]-OTDR detection device comprises a time delay generator, a laser, a pulse modulator, an erbium-doped optical fiber amplifier, an optical circulator, an optical fiber detection unit, a first coupler, a time delay optical fiber, a polarization controller, a second coupler, an avalanche photodetector and a signal collection card. The optical fiber detection unit comprises a plurality of optical fibers which are connected in sequence, and the fixed reflection points are respectively formed at the connection parts on two ends of each optical fiber. The invention further discloses a detection method of the novel [phi]-OTDR detection device based on the fixed reflection points. According to the invention, the vibration around the optical fiber detection unit is measured by the optical fiber detection unit, and the vibration position, the frequency and the amplitude are monitored in real time by means of three