◆Fiber and hair analysis: In the course of criminal investigation, hairs and fibers are common trace physical evidence. The scanning electron microscope can be used to clearly distinguish human hair from animal hair and observe details of the hair, such as racial traits, whether it has been chemically treated, etc., through high magnification, thus providing key clues to the case detection.

◆Particle analysis: Particles such as soil, dust, etc., are often associated with specific locations. The scanning electron microscope can be used to analyze soil samples collected from items such as the shoes of the suspect, which can reveal the structure and composition of minerals, sand, and other elements contained therein, so as to determine whether the suspect was present near the crime scene.

◆Material fracture and surface topography: The scanning electron microscope can be used to observe and analyze material fractures, surface topography, and deformation layers, providing valuable information about the manner, strength, and direction of physical evidence damage.

◆Microstructure analysis: The scanning electron microscope can be used to accurately observe the microstructure of samples such as metals, ceramics, minerals, etc., which helps to identify hidden clues in physical evidence, such as tiny scratches, dents, or attachments.

◆Element distribution and content determination: The X-ray spectrometer of the scanning electron microscope can perform qualitative and quantitative analysis of the chemical composition of the micro area and the distribution of elements on the surface of the material (point, line and surface). It helps to determine whether the physical evidence contains specific chemicals, such as explosive residues, drug components, etc.

◆Membrane material analysis: In the field of criminal investigation, membrane materials such as paints and coatings may also become key physical evidence. Through the analysis of the scanning electron microscope, the composition, structure and preparation process of these membrane materials can be understood, which provides strong support for case detection.

◆Non-destructive testing: The scanning electron microscope will not cause any damage to the physical evidence during the analysis of the physical evidence, ensuring the integrity and originality of the physical evidence. It is of great significance for subsequent court trials and evidence preservation.

◆Rapid analysis: The scanning electron microscope has intuitive, accurate and fast analysis capabilities, which can provide a large amount of physical evidence information in a short period of time, and buy valuable time for criminal investigators to solve cases.

In summary, the scanning electron microscope has a wide range of applications in criminal investigation, and its high precision, non-destructive testing, and rapid analysis make it one of the indispensable tools for legal medical experts and criminal investigators. The analysis of the scanning electron microscope can provide strong physical evidence support for case detection and promote the efficient development of criminal investigation.