| 摘要 |
A conventional infrared thermometer is equipped with a visible light source having exactly the same size and shape as the infrared detector to illuminate the target so as to visibly identify the area to be thermally measured. The light source is judiciously positioned within the system so as to make the images of the detector and the source formed by achromatic zooming optics coincide on the target surface. As a result, the exact location and dimensions of the target area under test are precisely identified and the system can perform errorless measurements of targets located at variable distances from the thermometer. Alternatively, the system is enabled to errorlessly measure the same target with variable spatial resolution.
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