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针对传统方法测量材料热膨胀系数受外界环境因素影响较大和测试方法较为复杂,提出了一种采用微型光纤法布里-珀罗(F-P)传感器测定光纤自身以及金属Al件热膨胀系数的新方法。采用HF腐蚀光纤的方式制作F-P传感器的工艺,在30~120℃的温度范围内测得裸光纤的热膨胀系数为5.2E-8K-1,同时将F-P传感器粘贴在金属Al件上,测得金属Al的热膨胀系数为23.25E-8K-1。实验结果对比材料自身在常温下的理论值具备很高的一致性,分析了误差产生的原因。实验结果表明,微型光纤F-P传感器的制作工艺简单,测试方法稳定可靠,同时可以推广至高低温等恶劣环境下的应用。
Aiming at the fact that the thermal expansion coefficient of the material measured by the traditional method is greatly influenced by the external environment factors and the test method is relatively complicated, a new method for measuring the thermal expansion coefficient of the optical fiber and the metal Al part by using a micro fiber Fabry-Perot (F-P) sensor is proposed. The process of fabricating the FP sensor by the method of HF etching fiber was adopted. The thermal expansion coefficient of the bare optical fiber was 5.2E-8K-1 in the temperature range of 30-120 DEG C, and the FP sensor was affixed on the metal Al piece. The metal The thermal expansion coefficient of Al is 23.25E-8K-1. The experimental results contrast the theoretical value of the material itself at room temperature with a high degree of consistency, analysis of the error causes. The experimental results show that the fabrication process of the micro-fiber F-P sensor is simple, the test method is stable and reliable, and can be extended to applications in harsh environments such as high and low temperature.