Monday, 6 January 2014

ST Laserstrike, 532nm Laser Strike protection technology from Brinell & Sierra Tango




www.stlaserstrike.com
                                                                                                                                                                                          

A Sierra Tango LLC/Brinell Vision Ltd. Joint Venture 



532nm Aviation safety with Brinell CNG Green laser technology

Pilots view on landing when a green 532nm laser is shined into the cockpit.

Green LASER lights which can blind pilots have been fired at planes landing at Airports leading to some pilots having to cover their eyes and others taking evasive action. On each occasion, a powerful laser pen – which can focus a green beam of light at 532nm over several miles – has been used. The devices, which can cost more than £100 and are generally used by astronomers and scientists, have now become dangerous toys.

A cargo plane from Aberdeen was forced to drop 400ft as it approached the runway to avoid a green beam. An easyJet Airbus carrying 59 passengers and six crew travelling on the same flightpath from Stansted was targeted 30 minutes later. Both pilots were dazzled by the beam, suffering a temporary loss of vision, and were forced to cover their eyes at a crucial point in the descent.
In March this year two adults were arrested in March after a laser was aimed at a commercial plane near Midway Airport in Chicago. A police helicopter sent to investigate was also illuminated.

Sudden exposure to laser radiation during a critical phase of flight, such as on approach to landing or departure can distract or disorient a pilot and cause temporary visual impairment. Permanent ocular damage is unlikely since the laser source is generally reduced in intensity due to scattering and absorption over the long distances in the atmosphere. In addition the the eye’s blink response could further limit exposure.

However flight simulator studies have shown that adverse visual effects from laser exposure are especially debilitating when the eyes are adapted to the low-light level of a cockpit at night. Recovery of visual performance after exposure to laser light may take from a few seconds to several minutes. This effect could be even worse for example when the glass canopy of a Helicopter is illuminated by green laser. Apart from the obvious distraction of such a flash, the three most commonly reported physiological effects associated with green laser exposures are:

Glare
Visual blocking of an object in a person’s field of vision due to a bright light source located near the same line of sight.

Flashblindness
Temporary loss of vision after the source of illumination has been removed.

Afterimage
A transient image left in the visual field after an exposure to a bright light.

Laser protection filters for infrared laser applications are relatively easy to design because the wavelengths emitted by such lasers are outside of the visible spectrum. The 532nm wavelength emitted by green lasers, however is in the centre and most sensitive part of the human Photopic region making filter design more of a challenge.

Brinell Vision has developed a laser safety filter technology which allows the user to see a completely balanced colour view while totally blocking the laser at 532nm. In addition the technology provides outstanding visible light  transmission when compared with other types of 532nm blocking technologies.Other types of 532nm laser filters use absorbing materials which generally remove all the blue and a signifcant amount of green from the visible spectrum. This makes the eyewear completely unsuitable for flying or in fact operating any piece of important equipment.

The Brinell CN-Green filter has been developed using an advanced thin film design and deposition technology to produce optimised blocking for 532nm while allowing all other areas of the visible spectrum to transmit. This provides outstanding colour balance and high transmission in the visible region of the spectrum. Brinell CN-Green advanced filter technology is already being utilised by world leading optics and laser companies in demanding applications such as medical surgery and astronomy.






High blocking levels for 532nm.









Brinell CN-Green Colour optimisation for neutral transmission



If you are interested in purchasing Pilot's Laser Strike Glasses you can find more information at:
www.stlaserstrike.com



Applications:
·         Laser protection in Medical and fluorescence technology
·         Laser viewing window with colour correction for surgery
·         Military laser safety
·         Pilot safety
·         Industrial and research

Features:
  • High durability advanced thin film interference filters with low absorbing design to work with high powered laser sources.
  • Neutral colour balance for critical applications.
  • Blocking levels from OD3 - OD6
  • optically stable/low thermal shift in CWL
  • low absorption
  • no ‘Burn out’
  • operation at high temperature
  • custom designed and UK manufactured
  • Available in a large range of frame-styles from PROTECT Laserschutz GmbH
For more information about advanced laser protection solutions contact us at:






Tuesday, 10 December 2013

Colour balanced green laser filter technology (Brinell 532nm CN-Green technology)


http://www.brinellvision.com/
info@brinellvision.com



Greenlight Laser therapy is an innovative, non-invasive procedure which is revolutionising medical procedures in areas like treatment of enlarged prostate and removing tumours in cancer treatment.

The wavelength of 532nm (green) is highly absorbed in the red colour of the haemoglobin and the brown colour of the melanin. This guarantees for safe and successful coagulation and Vaporisation. High-power green KTP lasers provide a way to cut away the tumour, cauterize the area and radiate tissue in a single procedure. It is currently being used in prostate cancer patients, but research suggests that it might prove valuable in the treatment of other cancers as well. A high powered 532nm laser can also be used to destroy surplus prostate tissue which is blocking the bladder in the case of enlarged prostrate.

The laser vaporises excess tissue using safe and precise energy pulses. There is very little bleeding, reduced risks of complications and patients can return home within 24 hours.
 

Laser protection filters used for infrared medical laser applications such as Nd:YAg and Holmium are relatively straight forward to design as the working wavelengths are outside of the visible area. Good quality products laser protection goggles and filters provide high levels of visibility (VLT) without affecting the colour balance.
Laser Protection eyewear and filters used for 532nm Green Laser is however a much more difficult issue as the laser is operating in the centre of the visible spectrum. Brinell Vision has developed a class leading technology which allows the user to see a completely balanced colour view while totally blocking the laser at 532nm (to levels as high as OD7). Brinell vision CN-Green technology is being used by Europe’s top laser protection manufacturer Protect Laserschutz GmbH to provide the finest 532nm protection eyewear available worldwide.   




Filters for Greenlight Laser (Brinell CN-Green Technology) 

Brinell Vision use an advanced plasma beam sputtering process to create a seamless optical interference coating. The process is tuned to give optimised blocking at 532nm while transmitting a completely colour balanced spectrum in the visible bandwidth.

The materials deposited are completely inert, chemically and optically stable in the harshest environmental conditions.  

-optically stable/low thermal shift in CWL
-low absorption
-no ‘Burn out’
-operation at high temperature
-custom designed and manufactured by Brinell Vision Limited 
-OD from 3 up to 6+



Brinell CN-Green (532nm) protection filter has been carefully colour corrected to give a critical neutral transmision.





Colour optimisation for neutral transmission

Contact us for more information about our advanced medical filter solutions: info@brinellvision.com

or visit our web shop
Brinell CN-G filter technology (Web-shop)