The sample is positioned on a stage in the chamber of the microscope before a vacuum is created in the chamber via a series of pumps. This works differently to transmission electron microscopes (TEMs) as the electron beam goes straight through the object.Įlectrons are created and fired using an electron gun which accelerates down the microscope passing through a series of lenses and apertures creating a focused beam which then interacts with the surface of a sample. SEM produces magnified detailed images of an object by scanning a focused beam of electrons. How Does a Scanning Electron Microscope Work? SEM produces images that can show information on a material’s surface composition and topography. National Structural Integrity Research CentreĪ scanning electron microscope (SEM) is a type of microscope which uses a focused beam of electrons to scan a surface of a sample to create a high resolution image.Structural Integrity Research Foundation.
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