▎ 摘　　要

NOVELTY - The sensor has a sensor shell (1) whose inner end is provided with an anti-interference mechanism that is provided with a sensor cylinder body (7), an optical fiber ring (5), an optical fiber wire (4) and an optical fiber coupler (6). Two connecting plates (2,3) are provided with a cavity that is fixedly connected with a graphene wave absorbing plate. The sensor shell is fixedly connected with two connecting blocks (9,10). A rubber ring (24) is fixed at an inner end of a circular groove. A magnet is fixed in a groove. A right side of a damp-proof shell (11) is jointed with a connecting cover plate (12), where the damp-proof shell and the connecting cover plate are made of stainless metal material. A right side of the damp-proof shell is formed as an open structure. USE - Anti-interference full optical fiber quasi-distributed fixed beam type low-frequency vibration sensor. ADVANTAGE - The sensor fixes the optical fiber wire and the optical fiber coupler by using the connecting plate to prevent shaking of the optical fiber line and the optical fiber coupler in the sensor shell to avoid influence to a measuring signal, easily disassembles and assembles the optical fiber ring by using the connecting block and the magnet, locates the rubber ring in the circular groove to protect the optical fiber ring and reduces vibration of the rubber ring. DESCRIPTION OF DRAWING(S) - The drawing shows a partial sectional view of an anti-interference full optical fiber quasi-distributed fixed beam type low-frequency vibration sensor. Sensor shell (1) Connecting plates (2,3) Optical fiber wire (4) Optical fiber ring (5) Optical fiber coupler (6) Sensor cylinder body (7) Connecting blocks (9,10) Damp-proof shell (11) Connecting cover plate (12) Rubber ring (24)