In this work, very high frequency ultrasound (140 to 1,300 MHz) was used to nondestructively characterize a set of chromium containing DLC coated coupons.

• 第一，高频扫描声声显微镜被用来探测镀层里表面以下的缺陷，并成功地生成出了小到1微米的缺陷的图像。