An optical fiber dual method-Peru pressure sensor, measuring device and calculation method

Abstract

The invention discloses an optical fiber dual method-Peru pressure sensor, which comprises a capillary, an incident optical fiber and a reflective optical fiber. The capillary includes a sealed end and an open end, and a reflective optical fiber with a length equal to the length of the first cavity is arranged inside the capillary near the sealed end. , the reflective fiber and the capillary form an intrinsic method-Peru cavity whose cavity length is the first cavity length, and is used to obtain the ambient temperature according to the first cavity length; an incident optical fiber is arranged at the capillary open end, and the distance between the incident optical fiber and the reflective optical fiber is The second cavity length, the incident fiber, the reflection fiber and the capillary form an extrinsic method-Pertin cavity with the second cavity length, which is used to obtain the extrinsic method-Pertin cavity data according to the second cavity length, and the extrinsic method-Pertin cavity Data are related to external pressure and ambient temperature. The invention can simplify the structure of the probe, eliminate the influence of the ambient temperature on the pressure sensor, and improve the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber dual method-Peru pressure sensor, a measuring device and a calculation method. Background technique [0002] Fiber-optic Fabry-Perot interferometer (FFPI), referred to as fiber-optic-Perot interferometer, or fiber-optic-Perot cavity, is a typical optical fiber sensing structure. [0003] According to whether the medium in the cavity is an optical fiber, it can be further divided into Intrinsic Fabry-Perot interferometer (IFPI) and Extrinsic Fabry-Perot interferometer (EFPI). Due to the advantages of simple fabrication, high sensitivity and good stability, the extrinsic method-Percavity sensor has been widely used in environmental measurement and large-scale structure monitoring, such as pressure and strain sensors. [0004] In the existing technology, such as figure 1 As shown, two extrinsic methods-Purcell cavity are used to form the pressure sen...

AI Technical Summary

Problems solved by technology

However, the introduction of additional structures will increase the complexity of the sensor, and bring various problems in the process of probe installation and packaging. For example, the optical fiber method of serial gratings-Pert cavity pressure sensor requires a stress-free closed fiber grating

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