Importance

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Abstract

A radiation thermometer is provided, comprising: a thermal radiation detector assembly having an operative surface area responsive to thermal radiation of a first wavelength; a focussing optics assembly adapted to focus both thermal radiation of the first wavelength and visible light of a second wavelength along an optical axis, the focussing optics assembly being configured to form a focussed image of the operative surface area of the thermal radiation detector assembly on a focal plane outside the radiation thermometer, the focussed image of the operative surface area defining a target region from which the thermal radiation detector assembly detects thermal radiation; a visible light source assembly adapted to exhibit an illuminated pattern of visible light of the second wavelength, the visible light source assembly comprising at least one visible light source and a mask through which light from the at least one visible light source is arranged to pass, the mask having one or more substantially opaque portions and one or more translucent portions arranged to define the illuminated pattern; and a radiation splitter adapted to deflect one of thermal radiation of the first wavelength and visible light of the second wavelength, and to transmit the other, or to deflect both wavelengths differently, the radiation splitter being configured so as to pass the thermal radiation along a first optical path from the focussing optics assembly to the thermal radiation detector assembly, and to pass the visible light along a second optical path from the visible light source assembly to the focussing optics assembly.

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First Claim