Research on Full Strain Measurement Performance of Non-intrinsic Optical Fiber F-P Sensor

As a new measurement information transmission method, optical fiber sensors have important potential applications in the field of high temperature measurement of aero-engine component materials.In this paper, based on the principle of multi-beam interference, a new structure of non-intrinsic optical fiber Fabry-Perot(F-P) sensor is made, and its deformation measurement performance in the process of static tensile test of aero-engine component materials at room temperature/high temperature is explored.Two types of specimens, flat plate and round bar, are used to perform static tensile tests at room temperature and high temperature under different surface roughness and two loading rates.The test results show that the non-intrinsic optical fiber F-P sensor with a new structure has the advantages of large measurement range, high measurement accuracy, and the measurement results are not affected by external factors, and can achieve over-range full-strain measurement of aero-engine component materials.In addition, it is significantly better than AVE in terms of measurement accuracy and equipment volume.