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在微泡成象过程中,重氮化合物经光解能释放出氮气。重氮化合物作为感光剂分散在合适的载体中,并经涂布、干燥成为微泡胶片。曝光后气体膨胀形成微泡,因微泡对光的折射率不同,而将所受的光散射开形成影象。因此,微泡影象是以入射光的散射为基础的;这同重氮化过程靠光线的吸收相反。从光的入射方向看微泡影象呈白色,用它作透明投影时,画面呈现暗色,因而能够用作黑白幻灯片或电影正片。
During microbubble imaging, diazonium compounds release nitrogen by photolysis. The diazo compound is dispersed as a sensitizer in a suitable carrier and coated and dried to form a microbubble film. After the exposure, the gas expands to form microbubbles, which scatter the light received by the microbubbles into an image due to the different refractive index of the light. Therefore, the image of the microbubble is based on the scattering of incident light; this is in contrast to the absorption of light by the diazotization process. The image of the microbubble is white when viewed from the direction of light incidence. When used as a transparent projection, the image appears dark, and thus can be used as a black-and-white slide or film.