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提出一种充分利用光纤光栅所能承受的应变量,显著提高了光纤光栅温度传感器在高温下的灵敏度的方法。在常温下制作传感器时,根据传感器需要测量的温度设置光纤光栅的预松长度;当温度升高到需要测量的温度时,光纤光栅才开始被拉紧,传感器才开始以高灵敏度方式工作。分析了预松长度和工作温度之间的关系。实验中,当预松长度分别为0.2 mm、0.5 mm、0.6 mm时,工作温度分别上升了25℃、50℃、61℃,并且灵敏度(约675 pm/℃)基本不变。实验结果和理论分析吻合,较好地证实了该方法的有效性。
A new method is proposed to make full use of the amount of strain that a fiber grating can withstand and significantly increase the sensitivity of the fiber grating temperature sensor under high temperature. When making the sensor at room temperature, the pre-relaxation length of the FBG is set according to the temperature to be measured by the sensor. When the temperature rises to the temperature to be measured, the FBG starts to be tightened until the sensor starts to work with high sensitivity. The relationship between pre-loose length and operating temperature is analyzed. In the experiment, the working temperature increased by 25 ℃, 50 ℃ and 61 ℃, respectively, and the sensitivity (about 675 pm / ℃) remained unchanged when the pre-loosening lengths were 0.2 mm, 0.5 mm and 0.6 mm respectively. The experimental results are in good agreement with the theoretical analysis, which proves the validity of this method.