Metal-Free Optical Pressure Sensor with High Sensitivity and Extensive Range

IF 6.9 2区 工程技术 Q2 ENERGY & FUELS CSEE Journal of Power and Energy Systems Pub Date : 2023-11-17 DOI:10.17775/CSEEJPES.2022.06240
Mao Ji;Meng Huang;Haomin Lyu;Sheng Shi;Bo Qi;Chengrong Li
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Abstract

Pressure monitoring of a transformer oil tank can grasp the pressure change process caused by gas production when severe internal defects occur and take timely measures to ensure the safe operation of the transformer. Existing pressure sensors generally use metal encapsulation or have an air cavity structure, threatening the transformer's insulation if it is directly used inside the transformer. To this end, this paper proposes a method for developing a high-sensitivity, large-range, and metallization-free optical pressure sensing device with temperature compensation. Fiber grating is encapsulated by fluorosilicone rubber and supplemented by an epoxy resin shielding shell on the outside. At the same time, a double-grating vertical arrangement is adopted to improve pressure measurement sensitivity, further avoiding the influence of temperature rise caused by a defect of the transformer on the measurement result of the sensor. In addition, by optimizing the geometric structure of the internal sensitizing element, pre-stretching length of the fiber grating, gap distance, and other parameters, probe size can be reduced while ensuring the sensor's performance. Results show the proposed method can meet the requirements of sensor fabrication with different sensitivities and ranges, and to a certain extent, both high sensitivity and extensive ranges can be taken into account. The sensitivity of the fabricated prototype is 15 pm/kPa, and the range is about 0.2 MPa. At the same time, the metal-free feature of the sensor makes it suitable for use in various oil-immersed power equipment. It records oil pressure changes caused by oil discharge breakdown, making it sensitive to small pressure changes in early failures.
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高灵敏度、宽量程的无金属光学压力传感器
对变压器油箱进行压力监测,可以掌握内部发生严重缺陷时产生气体引起的压力变化过程,及时采取措施,确保变压器的安全运行。现有的压力传感器一般采用金属封装或空腔结构,如果直接在变压器内部使用,会对变压器的绝缘造成威胁。为此,本文提出了一种开发高灵敏度、大范围、无金属化、带温度补偿的光学压力传感装置的方法。光纤光栅由氟硅橡胶封装,外部辅以环氧树脂屏蔽壳。同时,采用双光栅垂直排列,提高了压力测量灵敏度,进一步避免了变压器缺陷导致的温升对传感器测量结果的影响。此外,通过优化内部敏化元件的几何结构、光纤光栅的预拉伸长度、间隙距离等参数,可以在确保传感器性能的前提下减小探头尺寸。结果表明,所提出的方法可以满足不同灵敏度和范围的传感器制作要求,在一定程度上可以兼顾高灵敏度和宽范围。制作的原型灵敏度为 15 pm/kPa,量程约为 0.2 MPa。同时,该传感器的无金属特性使其适用于各种油浸式动力设备。它能记录油排出击穿引起的油压变化,因此对早期故障中的微小压力变化非常敏感。
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来源期刊
CiteScore
11.80
自引率
12.70%
发文量
389
审稿时长
26 weeks
期刊介绍: The CSEE Journal of Power and Energy Systems (JPES) is an international bimonthly journal published by the Chinese Society for Electrical Engineering (CSEE) in collaboration with CEPRI (China Electric Power Research Institute) and IEEE (The Institute of Electrical and Electronics Engineers) Inc. Indexed by SCI, Scopus, INSPEC, CSAD (Chinese Science Abstracts Database), DOAJ, and ProQuest, it serves as a platform for reporting cutting-edge theories, methods, technologies, and applications shaping the development of power systems in energy transition. The journal offers authors an international platform to enhance the reach and impact of their contributions.
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