论文部分内容阅读
提出了一种采用单光纤布拉格光栅(FBG)进行温度与应变同步测量的新颖设计。一根FBG被分成等长的两部分,用环氧胶水涂敷在其中一部分的表面,再套上金属套管,此时可以看成具有不同的布拉格波长的2个FBG,利用它们之间不同的杨氏模量和热膨胀系数,应变和温度能够同步测量。实验结果表明,在2700με和75℃的测量范围内,可以达到约6.1με和1.0℃的应变和温度精确度,误差主要来源于光谱仪分辨率的限制和FBG其中一部分的胶水涂抹不够均匀,通过使用高分辨率的解调仪和提高胶水涂抹工艺可得到更高的测量精确度。
A novel design for synchronous measurement of temperature and strain using single fiber Bragg grating (FBG) is proposed. An FBG is divided into two parts of the same length, coated with epoxy glue on one part of the surface, and then put on the metal sleeve, this time can be seen as two FBG with different Bragg wavelength, use them different Young’s modulus and thermal expansion coefficient, strain and temperature can be measured simultaneously. The experimental results show that the strain and temperature accuracies of about 6.1με and 1.0 ℃ can be achieved in the measurement range of 2700με and 75 ℃. The errors mainly come from the limits of the resolution of the spectrometer and the glue of one part of the FBG is not evenly applied. By using High-resolution demodulator and improve the glue coating process can get higher measurement accuracy.