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Frequently Asked Questions
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Specular reflection refers to the mirror like reflection of light entering and exiting a surface, where the angle of incidence equals the angle of reflection as defined by the law of reflection. Diffuse reflection, on the other hand, is the scattering in many directions of incident light after its reflection from a surface.
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Much work has been done to ensure that MIL specs and testing criteria surpass the
conditions of possible exposure to harsh military operational environments. Wamco
tests to MIL-STD-810 and can test for various other specific test requirements.
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Wamco's polymeric filters are designed with specific light source, product configuration and environmental requirements in mind. Polymeric filters utilize a wide range of complex chemistry which can be tailored and tuned to create an unlimited combination of filter solutions. Other benefits of polymeric filters include a short design cycle, formability, impact resistance, low weight and relatively low manufacturing costs. Wamco's SafeNight product line was developed to take advantage of the benefits of polymeric technology.
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Sunlight readability is the ability to read the legend in direct sunlight and the
capability for the indicia to be hidden when not lit. The LEDgen technology integrates
Wamco's SafeNight technology, customized to chromaticity requirements and unique surface
finish processes. The results provide invisible marking under high ambient sunlight
when not lit and outstanding contrast when the LEDgen is illuminated.
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Determining which filter is right for your application starts by selecting and understanding your light source. Based on this decision, a wide array of cost-effective possibilities can be recommended to meet your application requirements.
With well over 20 years of experience designing custom solutions, we highly encourage you to consult with one of our Optical Filter specialists in selecting just the right product for your unique application.
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Wamco's expertise in designing filters range from industry-standard solutions to custom applications with varying requirements.
Due to the very large number of standard filters produced by Wamco, consulting with one of our experts with regard to fulfilling your specific needs is highly recommended. Whether you are a novice or a seasoned lighting engineer, trust Wamco to guide you through the available options in the UV, VIS and IR spectra.
Wamco further specializes in the finishing processes needed to convert an optical filter from raw materials into a precision component, ready for use in a high-end device.
Click here to learn more about our capabilities in the realm of cut and finished filtering materials.
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Certainly! Wamco has engineered the SafeNight line of filters allowing full-screen touch capabilities while adhering to strict NVIS compliance standards.
Wamco's commitment to keeping our troops safe has allowed us to engineer solutions that maintain full functionality of combat devices for many popular handhelds, laptops and PDAs and offering various attachment methods.
Please contact Wamco to discuss your specific needs with one of our expert filter specialists.
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Green A defines a color or chromaticity of the end product. Class A defines the
type of goggle being used and how the night vision radiance is calculated.
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Wamco's standard rings, lamp assemblies, NVISable LEDs, polymeric and glass sheet materials are typically not controlled under the ITAR regulations. Determination of ITAR classification is application-dependant and would best be addressed through speaking with one of our specialists regarding the classification of your specific filter.
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All Wamco filtering materials are available with various solutions for EMI and Reflection Reducing surfaces. A wide and customizable selection of anti-reflective, glare reducing, ITO, wire and printed mesh finishes may be applied to Wamco finished products. Our monolithic and composite constructions provide the maximum protection and readability in bright light situations.
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Limiting sizes of surface defects is designated by two numbers which refer to two
graded sets of surface and/or internal quality standards. The first number refers
to scratches and the second number shall refer to digs. As an example, a requirement
of 80/50 would mean a scratch requirement of 80 and a dig requirement of 50. The
scratch size is evaluated by comparison to a scratch standard. The dig size
is measured by a unit of 1/10 of a millimeter (size 50 = .5mm).
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Such color variation in anti-reflective coatings is caused by the coating materials being used along with the more important distribution of reflectance across the visible spectrum. In comparing two MIL-C-14806 compliant samples meeting reflectance requirements but having different reflective colors, it is evident that different regions of the spectrum will reflect light at varying levels.
This difference from region to region will cause the overall color to possess a different hue, giving the piece a yellowish, neutral or even purplish color. This reflected color difference does not diminish the overall affect of surface reflectance or transmitted color of a finished optical element as long as the coating still performs within the specification requirements.
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Scratches on coated filters, composite filters and polymeric filters cannot be reworked.
A scratch on a non-coated glass filter could be reworked in some rare cases by re-polishing
the surface. However, the thickness reduction would likely affect the optical performance
of the filter.
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