How to find clues on the scene investigation - criminal technology light source articles One of the main contents of the crime scene investigation work is to comprehensively and meticulously search and discover various suspicious traces of physical evidence and biological evidence to extract evidence such as fingerprints, footprints and DNA that may be left by criminal suspects for individual identification. The criminal technology light source is an essential basic equipment necessary for on-site exploration and has the highest usage rate, and is directly related to the ability to discover physical evidence. Pure white light source Multi-band light source Pure white light source Pure white light source is the first to be used for on-site survey, and it is also the most commonly used light source. It is generally used for the search and discovery of conventional visual evidence. A good pure white light source should achieve the output light color temperature close to daylight, in order to restore the color more realistically; and the illumination spot area is large, the light intensity in the illumination area is uniform, and it is convenient for large-area efficient search. Multi-band light source The criminal technology multi-band light source consists of narrow-band, high-intensity output light of many different colors. The first generation was born in the late 1970s, when the type of light source used was a laser; The second generation of products was formed in the 1990s. For the shortcomings of lasers, the xenon lamp + filter + fiber output conduit was used. After entering the 21st century , with the advancement of science and technology, like other light sources in daily life, criminal technology multi-band light source has also fully adopted LED, the most common, mature and widely used lighting technology. Among the various output bands of criminal technology multi-band light source, blue light is most commonly used , and has good effects on biological sample discovery, fingerprint display, and suspicious trace search. Followed by long-wave ultraviolet light, violet light, blue-green light, green light and so on. In addition, in order to effectively excite the trace fluorescence of the evidence, a large contrast is formed with the background, and the output light of each band should be high intensity, narrow band, and the light intensity in the illumination area is uniform. At the same time, in order to effectively observe the trace fluorescence, the fluorescence observation cut-off filter used in combination should also adopt a high-quality glass filter with high cut-off precision and high light transmission rate. The Kelai series of criminal technology light source adopts high-quality LED light-emitting diode array technology, which has narrow output light band, high purity, high intensity and uniform light intensity in the illumination area. It cooperates with the German Schott fluorescence observation cut-off filter to stimulate the fluorescence of trace evidence. And the observation effect is good. At present, the Kelai series of criminal technology light sources have been widely used throughout the country. In many cases of murder, wealth, and traffic accidents, all kinds of important evidences such as fiber, hair, blood marks and body fluid spots are effectively found. The site surveyors are widely recognized and highly praised. herpes zoster vaccine,Hepatitis B Vaccine For Adults,Tetanus Booster,Td Vaccine FOSHAN PHARMA CO., LTD. , https://www.fs-pharma.com.jpg)
Criminal technology light source can be divided according to different output light bands 
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