Langfang Danmei security equipment Co., Ltd.
Langfang Danmei security equipment Co., Ltd.
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BTZZ-I Thermotropic fluorescence instrument for developing sweat fingerprint on paper
Purpose
Heat the paper with fingerprint to develop fingerprint in fluorescence.
Composition
| Item | Product Name | Qty. |
| 1 | Fingerprint paper heater | 1 set |
| 2 | Dual light sources fluorescence observation box | 1 piece |
| 3 | Blue barrier filter | 1 pair |
| 4 | Green barrier filter | 1 pair |
| 5 | Canon EOS700D camera | 1 piece |
| 6 | Tamron 90mm macro lens | 1 piece |
| 7 | Camera stand | 1 piece |
Description
A. The fingerprint paper heater is composed of a moving tray, an infrared radiant heater and the control circuit. The moving tray carries the fingerprint paper to move slowly under the heater and receive heat radiation. The heating time and temperature can be set by the control circuit.
B. There are blue and green light sources in the observation box, and both light source output ports are equipped with band-pass interference barrier filters. At the top of the observation box, there is a rectangular observation hole for inserting barrier filter, and the fingerprint fluorescence can be observed through the barrier filter.
C. The camera is mounted on the camera stand, and the fingerprint fluorescence can be photographed through the barrier filter.
Working principle
When the amino acid in the fingerprint is heated to 180-210°C, its chemical structure changes and becomes fluorescent substance, which can be viewed with a 400-540nm light.
Specifications
| Max. paper size | 240 x 320mm |
| Power supply | 220V / 50Hz |
| Heating power | 500~1500W, adjustable |
| Heating time | 20~300 seconds, adjustable |
| Heating temperature | 50-260°C |
| Blue light range | 430-470nm, equipped with band pass interference filter |
| Green light range | 470-510nm, equipped with band pass interference filter |
| Power of blue light | 50w |
| Power of green light | 50w |
| Blue light barrier filter | longwave-pass interference filter, passing wavelength ≥ 480nm |
| Green light barrier filter | longwave-pass interference filter, passing wavelength ≥ 520nm |
| Heater size | length 700mm, width 620mm, height 410mm |
| Observation box size | length 315mm, width 200mm, height 185mm |
Method
A. Switch on the heater, place the fingerprint paper on the moving tray, and set the heating temperature and the tray moving speed. Press the START button to start heating, and the tray will carry the paper to pass through under the heater. The temperature sensor measures the temperature in real time and controls the temperature to remain at the set temperature.
B. Place the heated paper into the fluorescence observation box, insert the blue barrier filter into the observation hole, turn on the blue light, and observe the fingerprint fluorescence through the barrier filter.
C. If the paper itself fluoresces and interferes with the fingerprint fluorescence, switch to green light. Insert the green barrier filter into the observation hole, turn on the green light, and observe the fingerprint fluorescence through the barrier filter. Most papers do not fluoresce with a 470-510nm light.
D. After a good fingerprint is observed, mount the camera onto the camera stand and photograph the fingerprint through the barrier filter.
Comparison of effects
A. A large number of comparative experiments have shown that, for fresh sweat fingerprint on paper, this method is more efficient than ninhydrin and is equivalent to DFO and 1,2-indanedione; for old sweat fingerprint on paper, this method is more efficient than ninhydrin, DFO and 1,2-indanedione.
B. The fingerprint developed with this device can be re-developed with ninhydrin, DFO, 1,2-indanedione or physical developer.
C. No need for complicated chemical treatment, fast (30-60 seconds) and damage-free development process, especially suitable for rapid processing of a large number of exhibits.
Application areas for our products include crime scene investigation, fingerprint collection and development, footprint collection and development, tool marks collection, trace evidence collection, documents examination, forensic medical examination, forensic evidence collection, DNA collection, DNA disinfection, criminal photography, criminal investigation light source, narcotic drugs test, poison test, evidence packaging, evidence marking, crime scene plotting, crime scene protection, human body protection on crime scene.
Our Service
We can provide reliable product and service for you.
1. Q: Is it a reliable company?
A: Beijing Bulant Police Equipment Co.,Ltd. is a company specialized in forensic product, such as: crime scene investigation, trace detection, fingerprint development and extraction, footprint extraction, micro-evidence extraction, files & documents inspection, gunshots detection, forensic examine, DNA extraction, criminal photograph, forensic light source, alcohol test, traffic scene investigation, drug & poison examine, evidence packaging, consumables in lab, etc.
2. Q: What about the delivery?
A: We can offer the door to door services by air or by sea just depend on your actual request. Such as DHL, UPS, TNT, FEDEX…
3. Q: What is the package?
A: Aluminum alloy case/carton case/wooden case.
4. Q: Do you have any timely technology supports?
A: We have a professional technology supporting team for your timely services. We prepare the technical documents for you, also you can contact us by telephone, webcam, online chat (google talk, MSN, skype, yahoo).
5. Q: What is the payment method?
A: T/T, WESTERN UNION, MONEY GRAM, ESCROW, PAYPAL
6. Q: Do you take part in the world exhibition every year?
A: Yes, we took part in exhibitions every year since 2008.