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本文利用弹簧管对于压力的机械放大作用，将弹簧管与光纤光栅悬臂梁调谐技术相结合，研制了一种新颖的光纤光栅弹簧管压力传感器，大大提高了光纤布喇格光栅对压力测量的灵敏度，压力灵敏度系数可达－１７９×１０－４／ＭＰａ，比裸光栅提高了两个数量级，在０～１２ＭＰａ的压力范围内，光纤布喇格光栅中心反射波长的改变与压力成良好的线性关系同时由于悬臂梁热膨胀效应的影响，光纤光栅的温度灵敏度提高为裸光栅的７倍
In this paper, a new type of fiber grating spring-tube pressure sensor is developed by combining the spring tube with the fiber-grating cantilever tuning technology by using the mechanical effect of the spring tube on the pressure amplification. The sensitivity of the fiber Bragg grating to the pressure measurement is greatly improved , The pressure sensitivity coefficient can reach -179 × 10-4 / MPa, which is two orders of magnitude higher than that of bare grating. In the pressure range of 0 ~ 12MPa, the change of the reflection wavelength of fiber Bragg grating center with the pressure is good Linearity At the same time, due to the thermal expansion effect of the cantilever, the FBG’s temperature sensitivity is increased to 7 times that of the bare grating