BTLY-I Red barrier filter glasses

BTLY-II Orange barrier filter glasses

BTLY-III Yellow barrier filter glasses

Purpose

Illuminate the evidence with the monochromatic light of the multi-band light source and observe the fluorescence of the evidence through the barrier filter

Structural material

Working principle

A. The monochromatic light output by multi-band light source is called excitation light. Illuminate the evidence with excitation light, part of the excitation light is reflected by the evidence, and part of the excitation light is absorbed by the evidence. After absorbing the energy of the excitation light, the evidence will release fluorescence. Since the fluorescence released by the evidence is much weaker than the excitation light reflected by the evidence, the fluorescence is invisible when observed directly.

B. The barrier filter goggles use long-wavelength pass filter, which blocks light shorter than a specific wavelength and transmits light longer than a specific wavelength. This specific wavelength is called the cutoff wavelength. The wavelength of the fluorescence is longer than that of the excitation light. When the cut-off wavelength of the barrier filter goggles is longer than that of the excitation light and shorter than the fluorescence's wavelength, the fluorescence of the evidence can be seen.

Technical parameter

Red block wavelength shorter than 560nm and transmits wavelength longer than 580nm;

Orange block wavelength shorter than 520nm and transmits wavelength longer than 540nm;

Yellow block wavelength shorter than 440nm and transmits wavelength longer than 460nm.

Product Application

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.

Langfang Danmei security equipment Co., Ltd.established in 2012, 15 February, with registered capital of 22 million yuan, is located at Langfang City, Hebei Province. The company possesses four buildings, including production workshop, finished product warehouse, material warehouse and scientific research building, total area is 8934 square meters.

The company focus on development and manufacture criminal investigation equipment. We have a research and development team which has a full range of technical talents, including forensic science, machine design, machining, electronic circuit design, optical design, automatic control and chemical analysis.

After years of research and development, we have established a relatively complete criminal investigation equipment product system. The products application area includes fingerprint collection and examination, footprint collection and examination, tool marks collection, trace evidence collection, document examination, cartridge marks collection，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.