Abstract
We demonstrate an optical Fabry-Perot interferometer fiber tip sensor based on an etched end of multimode fiber filled with ultraviolet adhesive. The fiber device is miniature (with diameter of less than 60 μm), robust and low cost, in a convenient reflection mode of operation, and has a very high gas pressure sensitivity of −40.94 nm/MPa, a large temperature sensitivity of 213 pm/°C within the range from 55 to 85 °C, and a relatively low temperature cross-sensitivity of 5.2 kPa/°C. This device has a high potential in monitoring environment of high pressure.
Highlights
Optical fiber Fabry-Perot (FP) interferometric pressure sensors have been attractive for a wide range of applications in biomedicine, healthcare, civil engineering, and automotive and aerospace industries[1]
Many FP interferometer (FPI) sensors operated on cavity length change have relatively low pressure sensitivity except those based on thin diaphragm[2,3,4,5]
Because of the large size of tapered hole formed in the multimode fiber (MMF) and the large elasticity coefficient of UV adhesive, the fiber tip FP cavity is compact in size, robust in structure, simple in fabrication, and convenient in operation
Summary
1.4682 (at 1550 nm) is etched by use of hydrofluoric (HF) acid to form a tapered hole cavity. It can be observed from the figure that there are two dominant side peaks in the spatial frequency spectrum, located at ~0.0239 and ~0.0563 nm−1, respectively, which indicates an interference pattern of two FP cavities. From Eqns (2)–(4), by taking n1 = 1, n2 = 1.54, and the reflection coefficient of the surface of R1, R2 and R3 as (n1 − n2)2/(n1 + n2)2 = 0.0452, the reflection spectrum of the FP cavity device can be simulated and the result obtained is displayed, together with that obtained from the experiment as shown previously, to facilitate the comparison In the experimental fringe pattern is likely due to the initial phase of the fringe pattern and the dispersion effect of the optical fiber
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