Double-ring coaxial optical fiber displacement sensing equipment

The utility model discloses a double-ring coaxial optical fiber displacement sensing device. A double-ring coaxial optical fiber displacement sensing device comprises a dustproof device, a fixing plate arranged below the dustproof device, a fixing hole arranged in the fixing plate, an optical fiber sensor arranged above the fixing hole, a cover plate arranged in the dustproof device, a signal display arranged in the cover plate, and a cover plate buckle arranged in front of the signal display. A detection hole is formed below the cover plate buckle, an air injection device is arranged in the detection hole, an air chamber is arranged outside the air injection device, a sleeve is arranged in the air injection device, a plurality of springs are installed below the sleeve, an air bag is arranged below the springs, an air inlet seam is formed in the air bag, and an air outlet is formed above the air inlet seam. According to the utility model, through the air injection device arranged in the detection hole, intern