A pyrometer is non-contact temperature measuring device, generally the term is applied to instruments measuring temperatures above 600 degrees Celsius. It is typically used to measure temperatures of glowing hot metals in a steel mill or foundry. It is also known as an optical pyrometer.
One of the most common pyrometers is the absorption-emission pyrometer which is a thermometer for determining gas temperature from measurement of the radiation emitted by a calibrated reference source before and after this radiation has passed through and been partially absorbed by the gas. Both measurements are made over the same wavelength interval.
To measure the temperature of incandescent metals, you look through the pyrometer at the glowing metal, and turn a knob or ring which adjusts the temperature of a glowing filament projected into your field of view. When the color of the filament matches the color of the metal, you can read the temperature from a scale on the filament color adjusting knob/ring.
A pyrometer is a temperature measuring device, which may consist of several different arrangements.
A simple type of pyrometer uses a thermocouple placed either in the furnace or on the item to be measured.
One of the most common non-contact pyrometers is the absorption-emission pyrometer which is a thermometer for determining gas temperature from measurement of the radiation emitted by a calibrated reference source before and after this radiation has passed through and been partially absorbed by the gas.
This novel pyrometer addresses the range from 500 to beyond 3500°C. It is claimed to require no prior knowledge of the target, including the emissivity, to yield extremely accurate temperature determinations.
Concern over emissivity cancellation affects the design of ratio pyrometers: the closer together the wavelengths are chosen, the more likely the emissivities are to cancel; the farther apart, the larger the magnitude of the resultant signal, and the greater the precision.
Despite the absorptions, the new pyrometer measured the temperature accurately; this was verified later by purging the offgas.
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