【摘要】 提出一种全新的波面测量方法,利用光学折射原理和图像分析技术对实验水槽中的波面形态进行了大范围测量.把均匀黑白条纹作为标志板放在水底,通过竖直悬挂在实验水槽上方的CCD相机捕捉黑白条纹的图像;光线在水气界面的折射产生了受到调制的条纹图像,利用H ilbert变换可以精确得到条纹图像在调制前后的变化,进而计算出波浪波面的高度分布.该方法操作简便、造价低廉,对光学系统中的噪音干扰和非线性因素不敏感,能够达到较高的测量精度.更多还原

【Abstract】 A new method based on light refraction is presented for the measurement of wave surface elevation in wave flume via imaging technique.A plane painted with black and white stripes is put on the flume floor as an indication plane,which can be arranged easily and cheaply.The CCD camera is fixed above the flume with its optical axis arranged vertically to grab the images of stripes modulated by the wave surface.The modulated value can be calculated from the Hilbert transform, and then the wave surface elevation can be obtained.The method is not sensitive to the noise and nonlinear effects of optical process.更多还原