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In the modern usage, it is a device that from a distance determines the temperature of a surface from the amount of the thermal radiation it emits, a process known as pyrometry, a type of radiometry. The word pyrometer comes from the Greek word for fire, "πῦρ" ( pyr ), and meter , meaning to measure.
Thin-filament pyrometry (TFP) is an optical method used to measure temperatures. It involves the placement of a thin filament in a hot gas stream. It involves the placement of a thin filament in a hot gas stream.
Pyrometric devices gauge heatwork (the combined effect of both time and temperature) when firing materials inside a kiln.Pyrometric devices do not measure temperature, but can report temperature equivalents.
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[3] or in some instruments from a current-vs-temperature table. The filament seems to "disappear" against the background of the object because two objects at the same temperature have the same black-body spectrum .
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