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三透射照相检疵法 (甲)装置透射照相检疵法比起透视及其他方法有着许多优点:例如,高的灵敏度、能够保留形象、可以从图上量取相当的尺寸、并可根据这些尺寸计算瑕疵的准确的尺寸、以及瑕疵所在的位置等;所以,这个方法在实际透射检疵上是很通行的。 [图三]是照相法器具的装置原理图。伦琴射线管1是射线的泉源,射线管安装在一圆筒状的铅套2内。装有底片的铝盒3放在距离射线管焦点35至50公分处。为了加强射线的作用,通常在盒子里贴着底片的两面各装一块萤光板,并使塗有萤光材料的那一面对着底片。如果检验品由于形状的关
Triple Transmission Photographic Detection Method (A) The transmission photographic detection method has many advantages over fluoroscopy and other methods. For example, the high sensitivity allows the image to be preserved, the equivalent size can be taken from the image, Calculate the exact size of the defect, as well as the location of the defect, etc. Therefore, this method is very common in the actual transmission of imperfections. [Figure 3] is photographic equipment device schematic. The x-ray tube 1 is a source of radiation and the tube is mounted in a cylindrical lead sleeve 2. The aluminum cassette 3 with the negatives placed 35 to 50 cm from the focal point of the tube. To enhance the effect of radiation, it is common practice to mount a fluorescent plate on each side of the box with the negatives facing the negatives with the fluorescent material. If the test article due to the shape of the off