Optical principle of three-eye microscope?

Structural principle, characteristics and application scope of stereomicroscope

Stereo microscope can also be called solid microscope or dissecting microscope. It is a kind of visual instrument with positive stereoscopic impression. The principle of its optical structure is to adopt a primary objective lens, and the two beams of light after imaging the object are separated by two groups of intermediate objective lenses (also called zoom lenses) to form a certain angle, which is called the body viewing angle, which is generally 12 degrees-15 degrees, and then imaged by their respective eyepieces. Its magnification change is obtained by changing the distance between the intermediate lens groups. The double-channel optical path is adopted, and the left and right beams in the binocular tube are not parallel. In essence, two single-barrel microscopes are placed side by side, and the optical axes of the two barrels form the perspective formed when people observe an object with their eyes, thus forming a stereoscopic vision image in three-dimensional space. Its characteristics are: large field of view diameter, large focal depth, easy to observe all aspects of the detected object; Although the magnification is not as good as that of conventional microscope, its working distance is very long; The image is square and convenient for practical work. This is because the prism under the eyepiece inverts the image. According to the actual use requirements, the current stereoscopic microscope can be equipped with a variety of accessories, such as eyepiece and auxiliary objective lens with higher magnification, in order to obtain greater magnification. A digital imaging system composed of digital camera, video camera, electronic eyepiece and image analysis software can be connected to a computer for analysis and processing through various digital interfaces. The lighting system also has reflected light and transmitted light, and the light sources are halogen lamps, ring lamps, fluorescent lamps and cold light sources. According to these optical principles and characteristics of stereomicroscope, it is widely used in industrial production and scientific research. For example, in the fields of biology and medicine, it is used for slicing and microsurgery; It is used for the observation, assembly and inspection of micro parts and integrated circuits in industry.