CAJ | 학술논문

相控阵超声监测成像是通过控制Lamb波发射与接收的时间延迟而控制其指向，当特定方向的Lamb波指向结构中损伤时形成反射信号，由此监测结构中损伤；将监测结构扫描范围内不同方向上Lamb波信号的归一化幅值用二维灰度图像显示，实现结构损伤成像。由于相控阵监测所得原始图像并不完美，因此，利用直方图匹配图像增强方法对原始图像进行处理，通过划分损伤图像的灰度级、统计各灰度级的分布情况、计算各灰度级的概率密度函数，得到直方图匹配处理的最终灰度变换关系，利用原始图像与输出图像各灰度级的映射关系，修改原图像的灰度级，获得增强图像。该方法在铝板、玻璃纤维复合材料结构与碳纤维复合材料结构中进行实验分析，验证方法的正确性和有效性。
상공진초성감측성상시통과공제Lamb파발사여접수적시간연지이공제기지향，당특정방향적Lamb파지향결구중손상시형성반사신호，유차감측결구중손상；장감측결구소묘범위내불동방향상Lamb파신호적귀일화폭치용이유회도도상현시，실현결구손상성상。유우상공진감측소득원시도상병불완미，인차，이용직방도필배도상증강방법대원시도상진행처리，통과화분손상도상적회도급、통계각회도급적분포정황、계산각회도급적개솔밀도함수，득도직방도필배처리적최종회도변환관계，이용원시도상여수출도상각회도급적영사관계，수개원도상적회도급，획득증강도상。해방법재려판、파리섬유복합재료결구여탄섬유복합재료결구중진행실험분석，험증방법적정학성화유효성。
he Lamb wave can directionally monitor the structure. The time delay of the signal is controlled in the process of transmitting and receiving. The normalized amplitudes of the scanning signals are drawn on a two-dimen-sional gray image to get the structural damage image. The original damage image is not perfect. The histogram matc-hing image enhancement method is used to improve the image recognition. Firstly,the gray level of the damage im-age is divided and the probability density function of the gray level is calculated. Secondly,the final gray transform relationship processed by histogram matching is gotten. Finally,the gray level of the original image is modified ac-cording to the gray level mapping relationship between the original image and the output image to obtain the contrast enhancement image. The method is conducted in the aluminum structure,the glass fiber-reinforced polymer and the carbon fiber-reinforced polymer to verify its correctness and effectiveness.