3Extrinsic Fabry–Pérot Interferometer‐Based Optical Fiber Sensing Technology
3.1 Principle of Fabry–Pérot Interferometer
Fabry–Pérot interferometer (FPI), which was first described in detail by Charles Fabry and Alfred Pérot of the University of Marseilles, is recognized as a long and distinguished history of the interferometer by the scientist in the optics and spectroscopy field. It is perhaps the versatility of such a fundamentally simple instrument that is most impressive, coupled with the fact that at so many turning points of physics, the FPI has provided critical information. Its coverage from the earliest days of atomic physics to the present age of coherent optics and the laser includes, for example, measurements of fine and hyperfine ...
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