The principle of portable multi band light source? Spot light refers to the feeling of color when people see an object. This feeling is the result of the spot light rays projected onto the object and reflected.

Portable multi-band light source light reflection: objects in nature have selective absorption and reflection of light of various colors. Spot lamp is when different colors of light shine on the object, some colored light is absorbed by the object, and some are reflected out. The spot investigation lamp shows that the absorption and reflection characteristics of fingerprint lines are different under the monochromatic light of each band. Therefore, in order to make the scene trace evidence flash out from the bearing object to the greatest extent, it is necessary to select the monochromatic light band of Zui large difference in absorption and reflection between the scene exploration lamp and the portable multi-band light source to flash and photograph the bearing object.

It is well known that the details of evidence on various objects are often very weak in the field investigation, and it is difficult to capture and record these details under ordinary light conditions. Because the object itself reflects and absorbs light differently, the appearance of the evidence will get different brightness distributions under the illumination of different bands of light sources, and then show different details. Only by choosing the appropriate portable multi-band light source can we enhance the display of trace evidence, and the scene investigation lamp can disturb the presentation of elements.

The key point of fingerprint on photographic object is to improve the contrast between fingerprint and object. If the contrast is zero, nothing can be seen. Therefore, in the field exploration, we often use different bands of light source to search, observe and photograph the evidence of the scene. What is a portable multi band light source and spot color.