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Analysis of LPFG Sensor Systems for Aircraft Wing Drag Optimization

机译：用于飞机机翼阻力优化的LPFG传感器系统分析

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In normal fiber, the refractive indices of the core and cladding do not change along the length of the fiber; however, by inducing a periodic modulation of refractive index along the length in the core of the optical fiber, the optical fiber grating is produced. This exhibits very interesting spectral properties and for this reason we propose to develop and integrate a distributed sensor network based on long period fiber gratings (LPFGs) technology which has grating periods on the order of 100 μm to 1 mm to be embedded in the wing section of aircraft to measure bending and torsion in real-time in order to measure wing deformation of commercial airplanes resulting in extensive benefits such as reduced structural weight, mitigation of induced drag and lower fuel consumption which is fifty percent of total cost of operation for airline industry. Fiber optic sensors measurement capabilities are as vital as they are for other sensing technologies, but optical measurements differ in important ways. In this paper we focus on the testing and aviation requirements for LPFG sensors. We discuss the bases of aviation standards for fiber optic sensor measurements, and the quantities that are measured. Our main objective is to optimize the design for material, mechanical, optical and environmental requirements. We discuss the analysis and evaluation of extensive testing of LPFG sensor systems such as attenuation, environmental, humidity, fluid immersion, temperature cycling, aging, smoke, flammability, impact resistance, flexure endurance, tensile, vitiation and shock.
机译：在普通光纤中，纤芯和包层的折射率沿光纤的长度不会变化；然而，通过在光纤芯中沿长度方向引起折射率的周期性调制，就制成了光纤光栅。这显示出非常有趣的光谱特性，因此，我们建议开发和集成基于长周期光纤光栅（LPFG）技术的分布式传感器网络，该技术的光栅周期约为100μm到1 mm，并嵌入机翼部分飞机以实时测量弯曲和扭转，从而测量商用飞机的机翼变形，从而带来了广泛的好处，例如减轻了结构重量，减轻了诱导阻力并降低了燃油消耗，这是航空业总运营成本的百分之五十。光纤传感器的测量功能与其他传感技术一样至关重要，但是光学测量在重要方面有所不同。在本文中，我们专注于LPFG传感器的测试和航空要求。我们讨论了光纤传感器测量的航空标准基础以及测量的数量。我们的主要目标是针对材料，机械，光学和环境要求优化设计。我们讨论了LPFG传感器系统的广泛测试的分析和评估，例如衰减，环境，湿度，液体浸没，温度循环，老化，冒烟，可燃性，耐冲击性，耐弯曲性，拉伸性，悬浮性和冲击性。

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