The visual inspection was carried through the crack, then the macro and micro observation of the crack, and the microstructure and the hardness of the shell were studied.

对钛合金壳体裂纹进行了外观检查，对其裂纹断口进行了宏、微观观察，并对其组织和硬度进行了检查。

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This is ideal optical instrument for micro observation in metallographic structure and surface morphology. It is suitable for research in metallography, mineralogy, precision engineering, etc.

适用于金相组织及表面形态的显微观察，是金属学、矿物学、精密工程学研究的理想仪器。

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At the present time digital holography is widely used in shape measurement, distortion shaking measurement, micro observation, information encryption, particle measurement, digital watermarking et al.

目前数字全息技术已经广泛应用于形貌测量、变形振动测量、显微观测、信息加密、粒子场测量、数字水印等领域。

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