透射电镜图像标尺的实验研究

Study on image scale for transmission electron microscope

目的研制数字图像标尺,并与胶片上的标尺比较。方法用数字成像装置在不同放大倍数下拍摄乳胶球衍模格栅标样(CP603),用格栅间的固有距离计算数字图像标尺;用数字成像装置和胶片同时拍CP603,以各自标尺测量格栅并比较。结果制作了31 500倍以下的数字图像标尺;数字标尺测量格栅的平均误差为1.72%,胶片标尺平均误差为2.27%。结论 CP603适合31 500倍以下透射电镜标尺的制作和放大倍数校正;数字标尺精度高于胶片标尺。

Objective To set up digital scale and compare the accuracy of the digital scale and the scale on film.Methods Pictures of CP603 were shot at different magnifications,the digital scales were calculated by using the inherent interval of grates.Pictures of CP603 were shot respectively with digital imaging apparatus and films,then the dimensions of grates measured and compared.Results Digital scales at different magnifications below 31 500 were created.The average deviation of digital scale and scale on films were 1.72% and 2.27% respectively.Conclusion CP603 is suitable for the establishment of digital scale under the magnification of 31 500.Digital scale is more accurate than the scale on film.