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不同环境条件下光纤布拉格光栅和长周期光纤光栅传感器的可行性。

Feasibility of fiber Bragg grating and long-period fiber grating sensors under different environmental conditions.

机构信息

Department of Construction Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan.

出版信息

Sensors (Basel). 2010;10(11):10105-27. doi: 10.3390/s101110105. Epub 2010 Nov 10.

Abstract

This paper presents the feasibility of utilizing fiber Bragg grating (FBG) and long-period fiber grating (LPFG) sensors for nondestructive evaluation (NDE) of infrastructures using Portland cement concretes and asphalt mixtures for temperature, strain, and liquid-level monitoring. The use of hybrid FBG and LPFG sensors is aimed at utilizing the advantages of two kinds of fiber grating to implement NDE for monitoring strains or displacements, temperatures, and water-levels of infrastructures such as bridges, pavements, or reservoirs for under different environmental conditions. Temperature fluctuation and stability tests were examined using FBG and LPFG sensors bonded on the surface of asphalt and concrete specimens. Random walk coefficient (RWC) and bias stability (BS) were used for the first time to indicate the stability performance of fiber grating sensors. The random walk coefficients of temperature variations between FBG (or LPFG) sensor and a thermocouple were found in the range of -0.7499 °C/ [square root]h to -1.3548 °C/ [square root]h. In addition, the bias stability for temperature variations, during the fluctuation and stability tests with FBG (or LPFG) sensors were within the range of 0.01 °C/h with a 15-18 h time cluster to 0.09 °C/h with a 3-4 h time cluster. This shows that the performance of FBG or LPFG sensors is comparable with that of conventional high-resolution thermocouple sensors under rugged conditions. The strain measurement for infrastructure materials was conducted using a packaged FBG sensor bonded on the surface of an asphalt specimen under indirect tensile loading conditions. A finite element modeling (FEM) was applied to compare experimental results of indirect tensile FBG strain measurements. For a comparative analysis between experiment and simulation, the FEM numerical results agreed with those from FBG strain measurements. The results of the liquid-level sensing tests show the LPFG-based sensor could discriminate five stationary liquid-levels and exhibits at least 1,050-mm liquid-level measurement capacity. Thus, the hybrid FBG and LPFG sensors reported here could benefit the NDE development and applications for infrastructure health monitoring such as strain, temperature and liquid-level measurements.

摘要

本文提出了利用光纤布拉格光栅(FBG)和长周期光纤光栅(LPFG)传感器对使用波特兰水泥混凝土和沥青混合料的基础设施进行无损评估(NDE)的可行性,用于温度、应变和液位监测。混合 FBG 和 LPFG 传感器的使用旨在利用两种光纤光栅的优势,在不同的环境条件下,对桥梁、路面或水库等基础设施的应变或位移、温度和液位进行 NDE 监测。对粘结在沥青和混凝土试件表面的 FBG 和 LPFG 传感器进行了温度波动和稳定性测试。首次使用随机游走系数(RWC)和偏置稳定性(BS)来表示光纤光栅传感器的稳定性性能。在 FBG(或 LPFG)传感器和热电偶之间的温度变化的随机游走系数被发现范围在-0.7499°C/[平方根]h 到-1.3548°C/[平方根]h。此外,在 FBG(或 LPFG)传感器的波动和稳定性测试中,温度变化的偏置稳定性在 15-18 小时的时间间隔内为 0.01°C/h,在 3-4 小时的时间间隔内为 0.09°C/h。这表明在恶劣条件下,FBG 或 LPFG 传感器的性能可与传统的高分辨率热电偶传感器相媲美。使用粘结在沥青试件表面的封装 FBG 传感器对基础设施材料进行了应变测量,在间接拉伸加载条件下进行。应用有限元建模(FEM)来比较间接拉伸 FBG 应变测量的实验结果。为了对实验和模拟进行比较分析,有限元数值结果与 FBG 应变测量结果一致。液位感测测试的结果表明,基于 LPFG 的传感器可以区分五个固定液位,并具有至少 1050mm 的液位测量能力。因此,本文报道的混合 FBG 和 LPFG 传感器可以受益于基础设施健康监测的 NDE 发展和应用,例如应变、温度和液位测量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bc23/3230987/61abd9ca5ca8/sensors-10-10105f1a.jpg

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