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嵌入聚二甲基硅氧烷（PDMS）膜片的双光纤布拉格光栅液位传感器：线性度与灵敏度分析

Liquid Level Sensor with Two FBGs Embedded in a PDMS Diaphragm: Analysis of the Linearity and Sensitivity.

作者信息

Morais Eliton, Pontes Maria José, Marques Carlos, Leal-Junior Arnaldo

机构信息

Graduate Program in Electrical Engineering, Federal University of Espirito Santo (UFES), Vitoria 29075-910, Brazil.

Physics Department & I3N, University of Aveiro, 3810-193 Aveiro, Portugal.

出版信息

Sensors (Basel). 2022 Feb 7;22(3):1268. doi: 10.3390/s22031268.

DOI:10.3390/s22031268
PMID:35162013
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8840254/
Abstract

This paper presents a fiber optic, liquid level sensor system based on a pair of fiber Bragg gratings (FBGs), embedded in a circular silicone (PDMS-polydimethylsiloxane) rubber diaphragm. The measurement principles of this sensor, whose diaphragm structure is about 2.2 mm thick with 45 mm in diameter, are introduced. To analyze the linearity and sensitivity of the sensor, the diaphragm was subjected to compression tests as well as to liquid level loading and unloading. The force and liquid level increase tests showed that inserting two FBGs (0.99453 for force and 0.99163 for liquid level) in the diaphragm resulted in a system with greater linearity than that with individual FBGs. This occurred where FBG1 showed 0.97684 for force and 0.98848 for liquid level and FBG2 presented 0.89461 for force and 0.93408 for liquid level. However, the compression and water level decrease tests showed that the system ( = 0.97142) had greater linearity with FBG2 (0.94123) and lower linearity with FBG1 (0.98271). Temperature characterization was also performed, and we found that sensitivity to FBG1 temperature variation was 11.73 pm/°C and for FGB2 it was 10.29 pm/°C. Temperature sensitivity was improved for both FBGs when compared with uncoated FBGs with typical values of 9.75 pm/°C. Therefore, the proposed FBG-based sensor system is capable of simultaneous measurement of force and temperature in a compact diaphragm-embedded system.

摘要

本文介绍了一种基于一对光纤布拉格光栅（FBG）的光纤液位传感器系统，该光纤布拉格光栅嵌入圆形硅橡胶（PDMS - 聚二甲基硅氧烷）膜片中。介绍了这种传感器的测量原理，其膜片结构厚约2.2毫米，直径45毫米。为了分析传感器的线性度和灵敏度，对膜片进行了压缩测试以及液位加载和卸载测试。力和液位增加测试表明，在膜片中插入两个FBG（力的相关系数为0.99453，液位的相关系数为0.99163）所得到的系统比单个FBG的系统具有更高的线性度。其中FBG1力的相关系数为0.97684，液位的相关系数为0.98848，FBG2力的相关系数为0.89461，液位的相关系数为0.93408时出现这种情况。然而，压缩和水位降低测试表明，该系统（相关系数 = 0.97142）与FBG2（0.94123）具有更高的线性度，与FBG1（0.98271）具有较低的线性度。还进行了温度特性分析，我们发现FBG1对温度变化的灵敏度为11.73 pm/°C，FBG2为10.29 pm/°C。与典型值为9.75 pm/°C的未涂层FBG相比，两种FBG的温度灵敏度都有所提高。因此，所提出的基于FBG的传感器系统能够在紧凑的嵌入式膜片系统中同时测量力和温度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/5a4b5b952e60/sensors-22-01268-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/a8cb4f817fd4/sensors-22-01268-g0A1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/e5f942a7556f/sensors-22-01268-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/44ab3c043963/sensors-22-01268-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/a3e249e0dea1/sensors-22-01268-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/6f8fc14d01eb/sensors-22-01268-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/f101acd55cea/sensors-22-01268-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/88e0bf7518b8/sensors-22-01268-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/bb5046a09667/sensors-22-01268-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/d42bf1ffe0b9/sensors-22-01268-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/5a4b5b952e60/sensors-22-01268-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/a8cb4f817fd4/sensors-22-01268-g0A1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/e5f942a7556f/sensors-22-01268-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/44ab3c043963/sensors-22-01268-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/a3e249e0dea1/sensors-22-01268-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/6f8fc14d01eb/sensors-22-01268-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/f101acd55cea/sensors-22-01268-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/88e0bf7518b8/sensors-22-01268-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/bb5046a09667/sensors-22-01268-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/d42bf1ffe0b9/sensors-22-01268-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9095/8840254/5a4b5b952e60/sensors-22-01268-g009.jpg

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