Patent ID: 6813959
Filing Date: 2004-11-09
Classification: G01L

Abstract:
A method for measuring a residual stress and photoelastic effect of an optical fiber, the method comprising the steps of:measuring a strain with varying the strain over said optical fiber by a motorized linear stage and collecting a light penetrability variation data by a photoelastic effect; and calculating a exact phase variation coefficient W(y) and a phase constant &dgr;o(y) for a given value y calculated by a following equation by using the collected light penetrability variation data in the form of sin2&PHgr; and the measured strain; &phgr;(y)=W(y)F+&dgr;0(y) wherein &dgr;o(y) is a phase constant distribution of the light passed through said optical fiber relative to the center of said optical fiber, F is a strain, and W(y) is a phase variation coefficient of the strain.