RADIATION THERMOMETER

摘要

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.;The length of the first optical path is substantially equal to that of the second optical path, such that the focussing optics additionally forms a focussed image of the illuminated pattern of the visible light source assembly substantially on the focal plane, the illuminated pattern being configured to mark the location of the target region in the focal plane. The illuminated pattern includes a primary illumination region and at least one secondary illumination region, the primary illumination region having substantially the same lateral extent as the operative surface area of the thermal radiation detector assembly and being positioned such that the image of the primary illumination region formed at the focal plane falls substantially within and is substantially co-incident with the target region from which the thermal radiation detector assembly detects thermal radiation, and the at least one secondary illumination region being configured such that the image of the or each secondary illumination region formed at the focal plane is located outside the target region.

主权项

1. A radiation thermometer 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; wherein the length of the first optical path is substantially equal to that of the second optical path, such that the focussing optics additionally forms a focussed image of the illuminated pattern of the visible light source assembly substantially on the focal plane, the illuminated pattern being configured to mark the location of the target region in the focal plane; and wherein the illuminated pattern includes a primary illumination region and at least one secondary illumination region, the primary illumination region having substantially the same lateral extent as the operative surface area of the thermal radiation detector assembly and being positioned such that the image of the primary illumination region formed at the focal plane falls substantially within and is substantially co-incident with the target region from which the thermal radiation detector assembly detects thermal radiation, and the at least one secondary illumination region being configured such that the image of the or each secondary illumination region formed at the focal plane is located outside the target region.