Due to the limitations of structure and materials of the traditional F-P sensor, it is difficult to complete the measurement work under harsh and complex working conditions such as aero engines, and it is easy to brittle and fail under complex internal and external forces. In order to improve the reliability of the optical fiber F-P sensor under harsh working conditions, this paper proposes a new type of stainless steel/quartz nested composite F-P sensor, which can not only realize strain measurement, but also reduce the influence of the external harsh working environment on the fragile optical fiber and the capillary quartz tube, effectively reduce the impact of air flow on the sensing element in the working environment, and significantly improve the wind load resistance of the F-P sensor.
The tension of fiber winding is one of the important factors in the performance of fiber. It is particularly necessary to measure the tension during the fiber winding process and to monitor the fiber tension after winding. This article adopts the method of optical fiber winding and uses OFDR (Optical Frequency Domain Reflectometry) demodulation technology to simulate fiber winding, and briefly introduces the principle of OFDR technology. Through experiments, the strain distribution of the full range of the fiber is measured. The measurement results are basically consistent with the calculation results.
Previous studies have shown that there is an obvious nonlinear phenomenon between the reflection wavelength and the ambient temperature when measuring temperature of fiber gratings made by UV exposure method. In the range of -30 to 80°C, this article conducts temperature calibration comparison experiments on uncoated fiber Bragg grating made by UV exposure method, the femtosecond-laser-inscribed fiber Bragg grating without coating and the femtosecond-laser-inscribed fiber Bragg grating with polyimide coating, it was found that there is also a nonlinear phenomenon between the reflection wavelength of femtosecond-laser-inscribed fiber Bragg grating and the ambient temperature. However, compared with the fiber grating made by UV exposure method, its nonlinearity is smaller, and on the femtosecond-laser-inscribed fiber Bragg grating with polyimide coating, the nonlinear phenomenon changed abnormally.
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