| 摘要 |
A three dimensionally measuring apparatus includes a gun, a pedestal of the gun, three microphones, a pedestal of a product and a data processor. The gun shoots very small bullets at a target such as a casting product. The very small bullets explode or rupture and high frequency sound at the time of hitting against the target. The three microphones catch the high frequency sounds. All these sound data are gathered to the data processor, and processed into three dimensional data of the surface of the product.
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