Many things about metal, cladding coated sensor, bandwidth, spectral bandwidth, reflectance spectra, mirrored surface, micrographic images, coated sensor, optical fiber, fringe spectrum, surface, interference, cavity, field scanning, light, and spectra are explained in this paper. The paper gives the reader things around bandpass filter, interferences, interferometric sensors, reflected cladding mode, fabrication, sensor, bandpass, distance, cladding, fiber, fringe, pressure, feedback, stage, power, and distances.
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The fabrication, implementation, and evaluation of an in-fiber white-light interferometric distance sensor that is capable of measuring the absolute value of an arbitrary small distance are presented. Taking advantage of the mode-coupling effect of a long-period fiber grating, an additional cavity distance is added to the optical path difference of the distance sensor; therefore, it can generate a sufficient number of fringes for distance demodulation even if the free-space cavity distance is very small. It is experimentally verified that the distance sensor is capable of measuring small distances that are beyond the capability of a Fabry–Perot interferometric distance sensor.
Also, this paper contains discussion about wavelength, distance sensor, effect, distance sensing, interferometric distance sensor, sensing, position, measurement, measuring, frequency, light interferometry, sensor probe, translation stage, cavity distance, and applied optics.