An infrared sensor including a plurality of infrared cameras is described. Each infrared camera includes an infrared detector and imaging optics. The imaging optics are arranged to image infrared light onto the infrared detector, the imaging optics having a field of view with a center optical axis, and field of view boundary lines bounding the field of view on sides of the field of view. The infrared cameras are arranged such that the center optical axes of the field of views intersect each other, and the fields of view overlap each other.
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