Experimental investigation of strain sensitivity for surface bonded fibre optic sensors

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2020-03-01 DOI:10.1016/j.sna.2020.111833

P. Motwani , N. Perogamvros , S. Taylor , M. Sonebi , A. Laskar , A. Murphy

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引用次数: 12

Abstract

The strain sensitivity coefficient for a surface-mounted fibre optic sensor is strongly affected by the type of adhesive material used for its installation. In the present study, appropriate strain correction factors have been investigated to modify the strain sensitivity coefficient for surface mounted fibre Bragg gratings to achieve accurate strain data. The experimental study adopts a fibre optic sensor (FOS) mounted on a carbon fibre reinforced polyphenylene sulphide specimen using two adhesive types, i.e. a cyanoacrylate and an epoxy-resin. For comparison purposes strain data was also captured using strain gauge, contact extensometer and digital image correlation instrumentation. The experiments reveal that the predicted correction factors vary considerably with the adhesive material used for the mounting of the FOS. Further analysis demonstrates that a 37 % deviation in the value of the correction factor results in a 27 % variation in the strain output. In addition, the microscopic image analysis confirmed that the thickness of the adhesive layer between FOS and the substrate affects the strain sensitivity of FOS and plays a crucial role in transmitting the deformation of the host material to the sensing element.

Abstract Image

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表面粘合光纤传感器应变灵敏度的实验研究

表面贴装光纤传感器的应变敏感系数受其安装所用粘合材料类型的强烈影响。在本研究中，研究了适当的应变修正因子来修正表面安装光纤布拉格光栅的应变敏感系数，以获得准确的应变数据。实验研究采用光纤传感器(FOS)安装在碳纤维增强聚苯硫化物试样上，采用氰基丙烯酸酯和环氧树脂两种胶粘剂。为了比较，还使用应变计、接触式延伸计和数字图像相关仪器捕获了应变数据。实验结果表明，所预测的校正因子随粘接材料的不同而变化很大。进一步分析表明，校正系数值的37%偏差导致应变输出的27%变化。此外，显微图像分析证实了FOS与衬底之间粘接层的厚度影响FOS的应变灵敏度，并在将主体材料的变形传递给传感元件方面起着至关重要的作用。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...