Patent ID: 8896302
Filing Date: 2014-11-25
Classification: G01R

Abstract:
1. A method for measuring magnetic induction intensity of a magnetic field using a short cavity fiber laser, comprising the steps of: a) providing the short cavity fiber laser, comprising: b) fixing the short cavity fiber laser on a magnetostrictive material; c) disposing the short cavity fiber laser and the magnetostrictive material in the magnetic field to be measured to match a stretching direction of the magnetostrictive material with a direction of the magnetic field to be measured; d) measuring a drift of a longitudinal mode of the short cavity fiber laser; and e) calculating the magnetic induction intensity corresponding to the drift of the longitudinal mode from an equation of: wherein Δλ wherein E f1 and E f2 represent elastic modulus of the fiber Bragg grating and the active optical fiber respectively, A f1 and A f2 represent the sectional area of the fiber Bragg grating and the active optical fiber respectively, L 1 represents the length of the fiber Bragg grating, L 2 represents the length of the active optical fiber, and L m represents the length of the magnetostrictive material.