What is the forensic multi-wavelengths light source?

Multi-band light source is usually caused by one or two groups of specially designed optical filters, white light emitted from the light source ( full spectrum ) into different bands of monochromatic light, then the light output by the light pipe, such an optical system to be known as multi-band light source. The system consists of light source, optical filter and the light pipe. The light source is generally divided into metal halide lamp or xenon lamp, sufficient intensity light output; And usually use high-quality and band-pass interference filters, ensure that the output light monochrome; The light pipe can be divided into two kinds of optical fiber and liquid light guide, to facilitate on-site related evidence search, inspection and photographic evidence with the help of light. Searching and detecting of latent fingerprint by multi-band light source at the crime scene, the most important is the choice of excitation bands and receiving bands.