In this paper, a Fabry-Perot interferometer filled with ultraviolet curing adhesive sensitization of high sensitivity fiber optic temperature sensor is proposed, by filling the F-P cavity with ultraviolet curing adhesive, due to the high coefficient of thermal expansion of the ultraviolet curing adhesive, the traditional fiber optic temperature sensor is achieved by primary sensitization. Combined with the optical vernier effect sensitization mechanism for secondary sensitization of the fiber optic Fabry-Perot interferometer, the sensor achieves a compact polymer-core sensing probe fiber optic interferometer structure and exhibits a temperature detection sensitivity of -17.55 nm/℃. This paper uses the F-P cavity peak phase spectral tracking algorithm for the vernier response spectrum collected by the vernier effect to obtain the peak spectral tracking and realise the high sensitivity detection.
Aiming at the existing density detection technologies, this paper proposes and designs a liquid refractive index (RI) sensor based on an all-fiber online Fabry-Perot interference cavity (FPI). We designed a real-time monitoring system by LabVIEW and performed density calibration, bubble and impurity interference and stability tests. The experimental results show that the effective cavity length of the FP cavity and the density have a good linear relationship, the fitting coefficient of the curve is as high as 0.998. Excluding the influence factors such as impurity,air bubbles and high temperature, the maximum offset between the measured value after temperature compensation of liquid density and the real value is within ±0.0024g/cm³.
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