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利用外径不同的常规单模和多模光纤成功制作了一种本征法布里-珀罗干涉型光纤传感器,对其温压响应进行了研究。由材料力学和光弹理论得出了压力响应理论模型,为了增加压力响应灵敏度,在考虑泊松效应导致应变方向的前提下,选择了多模光纤外径较小的结构。实验中传感器采用了经氢氟酸腐蚀外径为120 mm多模石英光纤,将制作的1 mm腔长的传感头进行了温度响应实验,温度范围为20℃~500℃,实验结果表明该传感器对温度有较好的线性响应,光程差响应灵敏度为25 nm/℃,且重复性较好;在常温20℃条件下进行了压力响应实验,实验结果表明该传感器具有较好的压力线性响应,其压力响应灵敏度为4.7 nm/MPa。该传感器能够对温度、压力实现较好的响应,同时具备准分布式测量的潜力。
An intrinsic Fabry-Perot interference fiber sensor has been successfully fabricated using conventional single-mode and multi-mode fibers with different outer diameters, and the thermo-compression response has been studied. The theoretical model of pressure response is derived from the mechanics of materials and the theory of photoelasticity. In order to increase the sensitivity of pressure response, the structure of multimode fiber with smaller outer diameter is selected considering the Poisson effect leading to the strain direction. In the experiment, the sensor uses the hydrofluoric acid corrosion outer diameter of 120 mm multimode quartz optical fiber, the fabricated 1 mm long sensor head temperature response experiment, the temperature range of 20 ℃ ~ 500 ℃, the experimental results show that the The sensor has a good linear response to temperature, the sensitivity of optical path difference is 25 nm / ℃, and the repeatability is good. The pressure response experiment is carried out at room temperature of 20 ℃. The experimental results show that the sensor has better pressure linearity Response, the pressure response sensitivity of 4.7 nm / MPa. The sensor to the temperature, pressure to achieve better response, with the potential of quasi-distributed measurement.