The invention discloses a temperature self-compensating double
grating symmetrical push-pull type
fiber grating vibrating sensor. The invention aims to realize a
fiber grating vibrating sensor which has the function of temperature self-compensation and has high sensitivity and favorable low-
frequency detection performance. The
fiber grating vibrating sensor is composed of a shell, two elastic body blocks, a
mass block, two sensing fiber Bragg gratings, two connecting seats and two support bases, wherein the
mass block is positioned between the two elastic body blocks; the connecting seats are respectively attached to two end faces of the
mass block, and respectively abuts against and adheres to one end of each of the two elastic body blocks; and the other end of each of the two elastic body blocks abuts against and adheres to each of the two support bases, thereby constituting a symmetrical push-pull type structure; the positions carved with fiber Bragg gratings on the two fibers are respectively packaged in the two elastic body blocks; and the mass block, the connecting seats, the elastic body blocks, the
fiber gratings and the support bases form a sensing probe and are arranged in the shell. The invention can eliminate the effect of temperature drift, has the advantages of high sensitivity, favorable low-
frequency detection performance, and can conveniently expand to three dimensions.