PARAMETER DESIGN METHOD FOR OPTICAL FIBER GRATING VIBRATION SENSOR

摘要

Disclosed is a parameter design method for an optical fiber grating vibration sensor, comprising the steps of: S1. setting an inherent frequency or sensitivity of the optical fiber grating vibration sensor; S2. selecting the category of the optical fiber, and obtaining the Young modulus and cross-sectional area of the optical fiber; S3. obtaining an equivalent elastic coefficient of the optical fiber by adjusting the number and effective lengths of optical fibers at two sides of a matrix; S4. obtaining vibrator quality according to the equivalent elastic coefficient of the optical fibers and the inherent frequency in step S1, or obtaining vibrator quality according to the effective lengths of the optical fibers, engraved with gratings, at one side of the matrix and the sensitivity in step S1; and S5. preparing a sensor according to the vibrator quality and other given or obtained parameter values so as to obtain a sensor having the inherent frequency or sensitivity. According to the present invention, optical fibers are taken as springs due to the strain sensitivity of the optical fiber grating, and therefore, a novel parameter design method for an optical fiber grating vibration sensor for vibration measurement is provided.