The diameter of the tube and the design of the reflective bowl determine the distance and position of the beam convergence point. Circular fluorescent light bulb is a bulb of peripheral illumination with no direction, it requires a reflective bowl to converge the light beam onto the illuminated object below the microscope. such as components on the printed circuit board, liquid crystal glass substrates, metal and non-metal surface dust, scratch damage, various kinds of particles, etc., and is also the most common way of illumination for stereo microscopes. It is very suitable for surface illumination of non-reflective objects, and is often used to observe and detect the edge of objects, surface structure, traces, etc. Ring Light Close Λ Ring light is a kind of "shadowless lamp", which is illuminated from a 360-degree annular angle, and can observe the change of the edge and height of the object to be observed. In actual work, such as industry, too many adjustment mechanisms may affect the efficiency of use, therefore choose the appropriated configured lighting conditions is very important. For microscope imaging, a good lighting system may be a system that allows for more freedom of adjustment. In addition, the whole beam and band adjustment of the light source, the position and illumination angle of the light source, and the intensity and brightness of the light all have a great influence on the imaging. Depending on the requirements of the microscope and the object to be observed, one type or multiple types of illumination at the same time can be selected. There are many types and shapes of light sources. Some of the microscope light sources are pre-installed on the body or frame of the microscope, and some are independent. Of which, selection and use of the illuminating light source is the most important part of the microscope illumination system, as and other components are designed around the illuminating wavelength curve and characteristics of the illuminating light source. Select and use different parts as needed. A complex and complete lighting system can include a light source, a lampshade or lamp compartment, a condenser lens, a diaphragm, a variety of wavelength filters, a heat sink cooling system, a power supply, and a dimming device etc.
The light color of the incandescent lamp is warm white, its color temperature is 2700K, the color temperature of the halogen lamp is about 3000K, and the color temperature of the daylight fluorescent lamp is 6000K. The color temperature of red is the lowest, then orange, yellow, white, and blue, all gradually increased, with the color temperature of blue being the highest.
Color temperature, with K (Kelvin) as unit, is a unit of measure indicating the color component of the light. The more lumens, the stronger the illumination. Luminescence intensity, with lumen as unit, is the physical unit of luminous flux. The most commonly used technical parameters for describing illumination are luminescence intensity and color temperature. In order to be able to observe a much smaller object and increase the resolution of the microscope, it is necessary to use light having a much shorter wavelength as the light source. The wavelength of visible light is between 380~780nm, the maximum multiple of optical magnification is 1000-2000X, and the limit resolution of optical microscope is about 200nms. Within the range of the visible light, the violet wavelength is the shortest, providing also the highest resolution. The resolution of the microscope is inversely proportional to the wavelength of the light source.
The wavelength of the light source must be smaller than the distance between the two points to be observed in order to be distinguished by the human eye. The wavelength of the light source is the most important factor affecting the resolution of the microscope. Choosing the correct illumination method can improve the resolution and contrast of the image, which is very important for observing the imaging of different objects. Illuminator Close Λ The conditions of different illumination of the microscope are a very important parameter.
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