1. An infrared scanner wherein an infrared image is moved relative to infrared detectors in a scanning movement, said improvement comprising: an array of a plurality of series of infrared detectors, each series made up of "N" infrared detectors where "N" is a positive integer, each series being aligned parallel to the scanning movement, adjacent series being spaced in the direction normal to the scanning movement by an amount equal to a desired distance between two scanning lines, each series having a first detector positioned ahead of the other detectors of that series in the scan direction, the first detectors being offset from one another in the scanning movement direction, the plurality of series comprehending in said normal direction the entire infrared image to permit coverage of said entire image in a single scan in the scanning movement direction.