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A radiation pyrometer estimates thermal radiation without direct interaction with a surface, by detecting red energy spectrum. It needs regular cleaning to ensure accurate results. It is commonly used in metallurgy and smelting industries.
A radiation pyrometer is a device that uses optical technology to estimate the thermal radiation of a surface, without the user ever having to interact directly with that surface. This is done by creating a machine that is sensitive to the color red – the color of objects above incandescence – and measuring the amount of thermal radiation escaping from that surface. Most radiation pyrometers are only sensitive to red, so objects below incandescent cannot be measured. These machines are durable, but the optical sensors need to be cleaned regularly to ensure they can see the surface and give an accurate radiation estimate. The most common use of pyrometers is in the metallurgy and smelting industry, because these industries are constantly using extreme heat.
When an object or surface becomes very hot, it becomes incandescent or hot enough to begin to glow. While a hot surface is obviously very hot, some industries need to know that it is hot without having to risk injury by directly interacting with the surface. A radiation pyrometer is used for this purpose, as it can detect the level of thermal radiation at a distance.
Radiation pyrometers work by detecting thermal radiation from the red energy spectrum. The unit is made to see the glowing surface via optical pieces, so it accurately estimates temperature based on color and light. The problem is, if the surface is hot but not incandescent, or if there are colder spots due to slag or discolored substances, the radiation pyrometer can give erroneous results. For this reason, some pyrometer manufacturers make the optical device capable of detecting thermal radiation below incandescent.
The radiation pyrometer is generally durable, but there is one part that must be constantly maintained: the optical piece. If someone accidentally touches this piece or if dust gets stuck on it, the pyrometer could detect colors incorrectly, leading to inaccurate results. The optical surface must be cleaned regularly to ensure that all thermal radiation measurements are accurate.
Metallurgists, foundries and companies working with metal are the main users of radiation pyrometers, because they always work with incandescent material. Workers must constantly observe and maintain high temperatures to ensure metals are alloyed, melted, or machined properly. Hot air balloons would use a radiation pyrometer to measure the temperature of the balloon’s air and tissue. They are also used by people who work with steam boilers.
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