A fiber Bragg grating (FBG) sensor integrated with an epoxy diaphragm was developed for the measurement of pressure and water level. The bending strain of a circular diaphragm induced by uniform pressure was transferred to the FBG sensor. The response of the FBG sensor to the pressure was observed in terms of the Bragg wavelength shift which is linearly proportional to the strain. The effect of epoxy diaphragm thickness on the sensitivity and accuracy was investigated. The experimental results show that the sensitivity of FBG/epoxy diaphragm pressure sensor is decreasing with the increase of the diaphragm thickness. The sensitivities of the FBG pressure sensors with diaphragm thicknesses of 0.5 mm, 0.7 mm, and 1.0 mm were 175.5 pm/kPa, 89.5 pm/kPa, and 43.7 pm/kPa, respectively. The pressure measured by the proposed FBG sensor was compared with theoretical prediction and a close agreement was observed.

中文翻译：

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集成了隔膜的iber Bragg光栅压力传感器

开发了集成了环氧膜片的光纤布拉格光栅（FBG）传感器，用于测量压力和水位。由均匀压力引起的圆形膜片的弯曲应变被传递到FBG传感器。FBG传感器对压力的响应是根据与应变成线性比例关系的布拉格波长偏移进行观察的。研究了环氧膜片厚度对灵敏度和精度的影响。实验结果表明，FBG /环氧膜片压力传感器的灵敏度随着膜片厚度的增加而减小。隔膜厚度为0.5 mm，0.7 mm和1.0 mm的FBG压力传感器的灵敏度分别为175.5 pm / kPa，89.5 pm / kPa和43.7 pm / kPa。