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A cold mirror is a dielectric glass filter that removes heat from light, transmitting infrared light and reflecting non-infrared light. They are used in various devices and can be customized by manufacturers for individual applications. Cold mirrors can also be combined to increase reflectivity and durability.
A cold mirror is a dielectric glass filter that is used to remove the heat content from the light that strikes the surface. It transmits infrared light and can also reflect spectral bands of non-infrared light, helping to eliminate unwanted or equipment-damaging heat. Devices that include a cold mirror dichroic filter include photographic and film equipment, various types of lighting systems, surgical lighting, dental office lights, projectors, and copiers.
Commercial and precision cold mirrors are common grades produced by manufacturers. They are commonly used with fiber optics because ultraviolet and infrared light can damage a fiber optic cable or other equipment used in association with it. Heat is also removed from cables and equipment that may be extremely sensitive to temperature changes. Potentially harmful light is captured by the cold mirror and reflected away from anything that may be adversely affected by light radiation at certain wavelengths.
A cold mirror comes in various forms and can be designed by manufacturers to fit individual applications specified by customers. It is possible to order mirrors with different angles. A cold dielectric mirror is often designed with an operating angle of 45° and is capable of reflecting more than 95% of the light while transmitting 85% or more of the infrared heat to which it is exposed. Manufacturers often allow customers to directly order cool mirrors with custom angles that fit their needs.
You can order a cold mirror that will reflect most of the ultraviolet light that strikes it while transmitting up to 90% of visible and other radiation. Cold dielectric mirrors are also available as coatings that can tolerate extreme environmental conditions, in contrast to metallic coatings which are adversely affected by wide variations in temperature and humidity. Combining different mirrors can increase reflectivity and allow the use of a new light filtering system at different bandwidths than each product is specified for.
A cool mirror can feature a durable design that can tolerate moisture and exposure to abrasive materials. Tough mirrors such as those specified for military standards are available. Any specifics should be outlined by the manufacturer on a spec sheet or on the company website. Knowing the application requirements and capabilities of each mirror is important to getting a cold mirror that performs exactly as it should in operation.
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