1. Product introduction:
When the power of 445nm or 532nm pure color laser is large enough, it can irradiate human body fluids (common carriers: fingerprints, sweat, blood, urine spots, sperm spots, etc.), hair, dandruff, nails, bone fragments, fibers, footprints and other traces of evidence The fluorescent substance in the fluorophore can excite the inherent fluorescence reaction to emit different wavelengths of fluorescence. After the blue or green light emitted by the laser itself is filtered through the filter, the inherent fluorescence of the trace evidence itself is revealed, which can be directly displayed. Shooting and extraction can effectively observe and record the signal light and images emitted by fingerprints and other traces. Generally, the blue laser is mainly for the search and discovery of biological evidence such as forensic DNA, and the green laser is better for the search and discovery of fingerprints and other traces.
2. Performance and use:
The system solves the current difficult to realize the problems of diffuse reflection, fingerprints on penetrating objects, and DNA biological evidence discovery and collection. It can stimulate potential and obsolete traces that are difficult to find by ordinary means, and facilitate large-scale search and discovery on site, and prevent criminal evidence Omission.
1. It can directly stimulate human secretions (such as semen spots, vaginal secretions, saliva, sweat stains, etc.) at the crime scene to emit strong fluorescence;
2. It can directly stimulate the in vitro tissues such as nails, skin fragments and bone fragments to emit strong fluorescence;
3. It can directly excite the fingerprints on the surface of relatively smooth and semi-permeable objects such as the wall and paper surface of the crime scene to emit fluorescence, and the fluorescent image of the fingerprints can be extracted through the attached color filter;
4. It can directly find potential bruises under the skin of the human body, scars that have completely recovered on the body surface and traces of wall repairs;
5. It can directly find trace residues such as chemical fibers, explosive residues, and some traces of pesticides left on site;
6. Enhance the appearance of weak fingerprint traces treated with other fluorescent powder, 502, rhodamine, DFO and other conventional reagents.
3. Main features and advantages:
The core components of the high-power portable laser material evidence inspection system (also known as laser material evidence surveyor, searcher, discovery instrument, etc.) use imported high-efficiency lasers as the luminous light source, and adopt fully independent research and development of uniform light technology and heat dissipation system, and undertake the project of the Ministry of Public Security. Self-developed high-end technology products.
1. The design is simple and fashionable, and the workmanship is excellent. The whole piece of magnesium-aluminum alloy is precision-carved by CNC machine tools.
2. Superior performance: The uniformity of the light spot far exceeds that of similar imported products, which makes the physical evidence and the background object fluorescence have a better contrast effect.
3. Portability: The advanced and sophisticated heat dissipation device makes the system‘s dual-wavelength equipment mainframe small in size and light in weight, as low as five kilograms, which is convenient for a single policeman to carry to various crime scenes, reduce work intensity, and truly realize portable survey sites .
4. Combined with the use of fluorescent occult blood display solution, it has a very good display effect on occult blood marks and blood fingerprints on the surface of difficult objects such as leaves, textiles, leather, masonry, etc.
5. Combined with the use of natural pure plant-derived fluorescent display powder, it can clearly display the sweat and grease fingerprint lines on the surface of difficult objects such as leather and plastic.
The system is small in size, light in weight, convenient to carry, simple to operate, uniform light spot, obvious fluorescence excitation effect, high discovery efficiency, high cost performance, etc. It is an extremely ideal crime scene investigation equipment for criminal investigation units at city and county levels.
Laser evidence discovery instrument
Four, technical parameters
1. Host technical parameters:
1) Basket laser wavelength: 445nm±2nm, green laser wavelength: 532nm±1nm, continuous non-pulse luminescence
2) The output optical power of the basket optical terminal: 10W, the output optical power of the green optical terminal: 6W;
3) Spot: Extremely uniform round spot, clear border without burrs, spot uniformity 98%;
4) Spot diameter: 40cm in diameter at 1 meter;
5) Dimensions: length, width and height are less than 250mm, 125mm, 135mm respectively
6) Weight: 5kg, including battery, convenient for single police to carry and use on site;
7) Output mode: optical fiber transmission, gun handle terminal output laser
8) Power supply mode: AC and DC;
9) Two portable carrying methods: shoulder-carried and hand-held
10) The service life of the laser light-emitting tube: more than 20,000 hours.
11) Battery management: More than 3 hours of battery life at full power, without reducing power as the battery power gradually decreases.
2. Technical requirements for light pipes:
1) Optical fiber type: imported high flexibility and bending resistant quartz laser communication optical fiber;
2) Length: 1.2 meters as standard;
3) Installation method: fixed, not freely pluggable.
4) The optical fiber is covered with soft rubber tube, fiber layer, and retractable metal layer three-level protective armor.
3. Requirements for light emitting handle:
1) Gun-style handle design, when the operator holds the handle, the light outlet is difficult to align with his face, which can effectively prevent the laser from hurting human eyes;
2) The weight of the handle is 250g, which effectively avoids hand fatigue during long-term continuous work on site survey.
3) The handle is equipped with laser switch key, power plus and minus and other control keys, which are convenient for operation and use during work;
4) The handle is equipped with a power and battery power display, so you can watch and control the light power and battery power at any time during operation.
Fourth, equipment stability requirements
1) The equipment must not only be convenient to carry, but also meet the transportation requirements in bumpy road conditions. The whole machine must pass the 90min/0.1mm/50HZ vibration test;
2) The whole machine must pass the 30℃/70% constant temperature and pressure test;
Five, basic configuration
1. One high-power blue-green laser host;
2. 1 battery charger;
3. Two sets of blue and green laser protective observation glasses;
4. One color filter for taking photos of physical evidence;
5. One set of occult blood fluorescence search reagent;
6. One bottle of green environmental protection non-toxic fluorescent display powder;
7. One waterproof, dust-proof and moisture-proof safety protection box;
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