March 2022
Intermediate to advanced
864 pages
28h 54m
English
Content preview from Optical Fiber Sensing Technologies
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8Sagnac Interferometer‐Based Optical Fiber Sensing Technology
8.1 Principle of Sagnac Interferometer
The Sagnac effect is discovered by the French scientist G. Sagnac [1]. The Sagnac effect means that two beams of light with the same characteristics are separated by the same light source, transmitted in the same closed optical loop in clockwise (CW) direction and counterclockwise (CCW) direction, respectively, and finally converged to a point and interfered. Figure 8.1a shows the propagation of two beams of light in the closed optical path when the relative inertial space is stationary (CW and CCW). The light entering the closed loop is divided into two beams with exactly the same phase and amplitude at the injection point M, and the return ...
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