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Barr Ups Capacity for Night-Vision Optical Filters
Oct 2007
Barr Associates Inc., a Westford, Mass., producer of thin-film coatings and optical filters, said it has enhanced its capability to manufacture filters for integration into infrared (IR) cameras used in night-vision technology for commercial and defense markets. For example, a filter that may be used in night-vision technology provides transmission from 8-12 um with blocking capability below that range. Barr said its coatings meet typical military specifications and are ROHS compliant for European markets. In the military, drivers use night-vision technology to navigate through hostile areas in darkness; it also reduces the potential for “friendly fire,” Barr said. "In addition, automotive crashes continue to account for a large number of lives lost each year. A disproportionate percentage of these collisions occur during nighttime driving." IR cameras enable drivers to see in total darkness, smoke, dust, rain and fog. Typical systems for vehicles provide between 250 and 450 ft of moderate illumination, the company said. "A driver traveling at 60 miles per hour would only have about four seconds to react to any obstacle in the road. By contrast, night-vision systems currently available in automobiles today increase the line of sight five times farther than headlight beams, which now gives the driver approximately 15 seconds to react to obstacles." As a result, automotive manufacturers are beginning to offer such systems as an option in newer models. Barr said it also offers solderable metal coatings for hermetic sealing.

optical filters
An optical element that blocks or transmits a selected wavelength of light. Optical filters can either be absorption filters or interference filters. Absorption filters absorb any unwanted wavelengths while the interference filter will use the effects of constructive and destructive superposition to transmit only the selected wavelength.
The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
Barr Associatescoatingsdefensefriendly fireheadlight beamsinfrared camerasNews Briefsnight-vision technologyoptical filtersphotonicsPhotonics Tech BriefsRoHSthin-film coatins

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