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利用单个侧边抛磨光纤光栅传感器上形成的双布拉格反射峰,进行微量液体材料在光波长为1550 nm处的热光特性研究。通过测量得到传感器双反射峰波长差与覆盖聚合物材料折射率间的对应关系以及光纤传感器覆盖某待测液体时双反射峰波长差与温度的对应关系,对这两个对应关系进行分析,得到了美国Cargille Lab公司的三种聚合物液在光波长为1550 nm处的热光系数。该光纤传感器可用于分析折射率处于1.4198~1.4479液体材料的热光特性。
The thermal properties of trace liquid materials at a wavelength of 1550 nm were investigated by using double Bragg reflection peaks formed on a single side-polished FBG sensor. By measuring the corresponding relationship between the wavelength difference between the double reflection peak of the sensor and the refractive index of the covering polymer material and the correspondence between the wavelength difference of the double reflection peak and the temperature when the optical fiber sensor covers a liquid to be measured, the two correspondences are analyzed to obtain The thermocouple coefficients of the three polymer solutions from Cargille Lab in the United States at a wavelength of 1550 nm were used. The fiber optic sensor can be used to analyze the thermal properties of liquid materials with refractive indices between 1.4198 and 1.4479.