基于光纤光栅的铝合金腐蚀监测研究

摘要

铝合金腐蚀是导致航空器性能下降的主要原因之一.铝合金腐蚀初期以点蚀为主,体积几乎不改变,结合铝合金腐蚀的这一特点,设计了基于光纤光栅的薄片型和应力束缚型两种腐蚀监测结构,对铝合金腐蚀进行了实验研究.腐蚀发生前,对光纤光栅施加一定预应力,随着腐蚀的发生应力被逐渐释放,通过测量传感波长的漂移量就可以得到铝合金的腐蚀情况.实验表明,基于光纤光栅的腐蚀监测结构能够真实的反应铝合金的腐蚀情况,并且光纤光栅本身具有体积小、抗电磁干扰、耐腐蚀的特点,非常适合于航空器的铝合金腐蚀监测.%Corrosion of the aluminum alloy is one of the main reasons for the degradation of the aircraft. Early corrosion, it's most pitting and volume hardly changed. Combined with these characteristics, we used optical fiber gratings sensor, designed two monitoring structures such as the leaf type and stress bound type, and researched on the corrosion situation of aluminum alloy through the high precision grating demodulation system. Before corrosion, stress is applied in the fiber gratings and gradually released with the corrosion. Corrosion situation of the aluminum alloy can be gotten by measuring the drift of the wavelength of sensor. According to the experimental results, it is shown that the real corrosion situation of the aluminum alloy based on optical fiber gratings corrosion monitoring structure, and optical fiber gratings has characteristics such as small volume, anti-electromagnetism interference and anti-corrosive, so it's very suitable for corrosion monitoring of the aircraft.