Business opportunity What are the advantages of LED light source in the field of criminal technology?

The light source device plays a great role in the potential crime scene trace evidence search, evidence inspection and identification of criminal photography etc., not only can effectively improve the extraction rate of spot traces and utilization, but also provide technical means more reliable and accurate evidence for the investigation of cases.

Application of 1 light source equipment in the field of Criminal Technology

1.1 evidence of latent traces on the scene of crime

The scene of the crime as the bearer of the facts of the crime sites and locations, contains a large amount of information and evidence of crime, crime scene investigation quality, field potential evidence extraction complete or not is the key of successful detection of the case. The intrinsic fluorescence can effectively stimulate the crime scene left fingerprints, footprint, blood and fiber trace evidence using the light source device specific, so that different traces occur in response to a specific wavelength of light, and easy to find search spot traces, show the ability and the collection rate greatly improves the potential field of trace evidence.

1.2 application of physical evidence examination and identification

The use of high sensitivity optical inspection, damage characteristics of materials, the use of equipment in the light of criminal technology in material evidence examination appraisal from fingerprint inspection, document examination, inspection of textiles is extended to the humoral test, gunshot residue inspection and other fields.

1.3 the application of Criminal Photography

The light source is also an important part of criminal photography equipment, photography light good value is very important to solve the potential and difficult object extraction and preservation of left traces has, from light photography, photography, photographic color separation polarized visible light, infrared reflection, to the special photographic UV reflection and infrared fluorescence UV fluorescence photography, both can get good effect by using different light source inspection camera.

2 criminal technology light source equipment requirements

The new criminal procedure law exploration standardized and scientific and technical personnel of public security organs for criminal scene of more stringent requirements, performance standards and inspection equipment for high quality scene investigation updating of the light source is also put forward higher requirements, so the accuracy of existing criminal technology light equipment low, large volume and practicability is not strong also highlights, has become an important problem restricting the development of criminal technology.

To solve this problem we must first improve the practicability and accuracy of test equipment, this equipment will be the main direction of development; secondly, working at the basic level of equipment miniaturization and multifunctional integrated can ensure the quality and efficiency of the survey and technical personnel to reduce the labor intensity; and simple operation, wide application popularization promotion of equipment will be the future trend of development. At present, the existing lighting equipment is not sufficient to satisfy the current high quality scene investigation and identification technology demand, therefore to enhance the technology and device performance improvement and development of new light source equipment, energy saving and high efficiency to improve the technical department of grassroots criminal scene, the ability and level of inspection and appraisal of evidence will have a great effect.

Spectral characteristics of 3.LED spectral modulation light source

The basic color theory common lighting LED based on white light, its weakness is to show the color coverage is not complete, and even need a variety of specific spectrum in spectral transform environment, LED source routine is incompetent. In the field of criminal technology, the requirements of light source and equipment can make people realize the response of specific materials to light and color. Site lighting using spectral modulation light source, method using pure physical full spectrum acquisition of the target, and the spectral information by reproducing the appropriate way to collect, this method can achieve the perfect site records preservation and reproduction, and ultimately achieve the integrity of the scene image information. The study of the technical scheme may be able to establish a complete set of technical tools in the practice of criminal science and technology.

Spectral acquisition due to visible light narrow-band filter high selectivity of the existence of the image data can be obtained with high precision spectral resolution, the visible range can obtain image data according to different wavelength intervals. But in the lack of the modulated light source spectrum on the basis of limited spectrum, the experimental research is still relatively small, the current LED technology covering the wavelength range as shown below, in the yellow light near the LED luminous efficiency is relatively low, and optional type is not complete.

Advantages of 4.LED light source in the field of Criminal Technology

At present, the traditional light source of criminal technology need power supply system, light source system equipped with large (halogen lamp, fluorescent lamp, high pressure sodium lamp or xenon lamp), filter system (filter lens filter), so that the light equipment are generally unable to meet the demand of selective light, light low efficiency, short service life, heat and power costs high maintenance costs and disadvantages, caused great distress to the primary investigators, and as a new source of criminal technology, compared with the traditional light source, LED light source has the advantages of its incomparable:

(1) narrow spectrum, light energy utilization rate of more than 36%; without filter system, only for LED light is any combination of different wavelengths and different spectral conditions, can cover the red yellow green blue, violet and ultraviolet range, can realize light intensity, light quality, light cycle adjustable;

(2) high photoelectric conversion efficiency, low cooling load, energy saving, energy saving and environmental protection;

(3) as cold light