Point Sensor of Reciprocity-compensated Type Fiber-optic Bi-directional Strain-displacement

In the reciprocity-compensated type fiber-optic bi-directional strain-displacement sensor,a coupler splits the light into the two fiber bonded in the tension or compression sections,and the modulated lights are measured by two detectors.By introducing the reciprocity-compensated parameter between the tension-sensitized fiber and the compensation-sensitized fiber,the error derived by the power fluctuate of optical source can be eliminate efficiently in the fiber-optic strain-displacement sensor.In the micro-displacement rack,the displacement experiment indicates that the standard error was ～0.16 mm.