Definitions for "Optical Pyrometer"
a pyrometer that uses the color of the light emitted by a hot object
Also called brightness pyrometer it uses a narrow band of radiation within the visible range (0.4 to 0.7 microns) to measure temperature by color matching and other techniques.
A device for measuring the temperature of an incandescent radiating body by comparing its brightness for a selected wavelength interval within the visible spectrum with that of a standard source; a monochromatic radiation pyrometer. Temperatures measured by optical pyrometers are known as brightness temperatures and except for black bodies are less than the true temperatures.