Dual-Fabry-Perot fiber pressure sensor, measurement device and calculation method

Abstract

The invention discloses a dual-Fabry-Perot fiber pressure sensor. The sensor comprises a capillary, an incident fiber and a reflection fiber, wherein the capillary comprises a sealed end and an opening end, one side in the capillary near the sealed end is provided with the reflection fiber of which length is the first chamber length, the reflection fiber and the capillary form an intrinsic-Fabry-Perot chamber which has chamber length of the first chamber length and is used for obtaining environment temperature according to the first chamber length; the opening end of the capillary is provided with the incident fiber, a distance from the incident fiber to the reflection fiber is a second chamber length, the incident fiber, the reflection fiber and the capillary form an extrinsic-Fabry-Perot chamber which has a second chamber length and is used for obtaining extrinsic-Fabry-Perot chamber data according to the second chamber length, and the extrinsic-Fabry-Perot chamber data is largely related to external pressure and the environment temperature. According to the sensor, probe structures can be simplified, influence of the environment temperature is eliminated, and measurement precision is improved.

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-Pertin interferometer, or fiber-Perot cavity, is a typical optical fiber sensing structure. [0003] According to whether the cavity medium is an optical fiber, it is further divided into an intrinsic method-Perot interferometer (IFPI) and an 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 sensor. However, ...

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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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