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In this paper, we fabricated a quasi-distributed intrinsic Fabry–Perot interferometric (IFPI) sensing array with the femtosecond laser. Each IFPI sensor is constituted by a pair of laser-induced internal reflectors and has a different cavity length. After multiplexing, IFPI sensors can be distinguished in the frequency domain for their different free spectral ranges. Next, a fast-Fourier-transform-based...
In this paper, an intrinsic fiber-optic Fabry-Perot (F-P) micro-cavity interferometer sensor fabricated by femto-second laser micro-machining technology is proposed and demonstrated experimentally. The insertion loss of the sensor head was measured under different laser writing conditions. And reflection characteristics of both single F-P micro-cavity interferometer and cascade F-P micro-cavity interferometer...
This paper presents a quasi-distributed Fabry-Perot fiber optic temperature sensor array using Optical Time Domain Reflectometry (OTDR) technique. The F-P sensor was made by two face to face single-mode optical fibers and their surfaces have been polished. Due to the low reflectivity of the fiber surfaces, the sensor was described as low Fresnel FPI. The working principle was analyzed using two-beam...
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