This manuscript presents the development of a low-pressure extrinsic Fabry-Perot fiber optic sensor based on a thin polyester film, using a phase signal analysis. The proposed interferometer is controlled by the simple contact interaction between the polymer membrane and a multimode fiber optic tip. The created cavity was uniformly stressed by applying a pressure varying from 0 to 2 psi. A finite element analysis was performed for these parameters. The stress applied to the membrane was below the yielding point. Thus, a linear study could be performed. The wavelength spectra exhibited a blue shift with a sensitivity of around 10.5 nm/psi. Although the interference spectra presented crosstalk measurements and required an initial set-point calibration, these effects were overcome by examining the spatial frequency components’ phase analysis. The sensors offered a high sensitivity, close to 3.5 rad/psi. Ultimately, this sensor is a high sensitivity and versatile alternative for low-pressure detection.

该手稿利用相位信号分析介绍了基于聚酯薄膜的低压外部法布里-珀罗光纤传感器的开发。所提出的干涉仪由聚合物膜和多模光纤尖端之间的简单接触相互作用控制。通过施加0到2 psi的压力，均匀地对生成的空腔施加应力。对这些参数进行了有限元分析。施加在膜上的应力低于屈服点。因此，可以进行线性研究。波长光谱显示出蓝移，其灵敏度约为10.5 nm / psi。尽管干扰频谱显示出串扰测量结果，并且需要进行初始设定点校准，但是通过检查空间频率分量的相位分析可以克服这些影响。这些传感器具有很高的灵敏度，接近3.5 rad / psi。最终，该传感器是低压检测的高灵敏度和多功能替代产品。