Abstract
We experimentally demonstrated a novel fiber-optic hybrid structured Fabry–Perot interferometer with special air-cavity for simultaneous measurement of transverse load and temperature. By the linear phase finite impulse response filters, the transverse load sensitivities of the air-cavity and the silica-cavity are 1272.71 pm/N and −53.07 pm/N, respectively, and temperature sensitivities of the air-cavity and silica-cavity are 1.1 pm/°C and 14 pm/°C. Thus, the different sensitivities of silica-cavity and air-cavity to transverse load and temperature indicate that such a structure can be used to simultaneously measure transverse load and temperature.
Highlights
In recent years, fiber-optic Fabry–Perot interferometer (FPI) has drawn great attention and been used for various physical quantities sensing, such as temperature[1,2,3], strain[4,5,6,7], pressure[8,9,10], and transverse load[11] et al, due to its advantages of low cost, high sensitivity, ultra-compactness and reliability
A novel fiber-optic hybrid structured FPI with special air-cavity that air-cavity height is higher than the cladding diameter of single mode fiber (SMF) is proposed and experimentally demonstrated for simultaneously measure transverse load and temperature
The hybrid structured FPI can be fabricated by fusion splice SMF to silica capillary and electrical arc discharge melting capillary to become hollow microsphere with special air-cavity, and final fusion splice SMF to hollow microsphere and cleaving to form silica-cavity
Summary
Where φair = 4πn1L1/λ, φsilica = 4πn2L2/λ, φair-silica = φair + φsilica, are the phase shifts corresponding to air-cavity, silica-cavity, and the hybrid-cavity, respectively; n1 and n2 are respectively refractive indexes of air and SMF; λ is the incident light wavelength. Such a hybrid structured FPI can be used to simultaneously measure transverse load and temperature. Different response to transverse load and temperature, this hybrid structured FPI can realize to simultaneously measure transverse load and temperature
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