Infra red detector system and method

摘要

A detector system is described in which an image of a scene is displaced with reference to a dual waveband detector array. Such ‘scanning’ increases the sampling density, thereby reducing the effective pixel pitch, by moving the image of the scene relative to the detector array by fractions of a pixel pitch in sequential frames. The display is then reconstructed with the data from these frames interleaved relative to the original scan displacement.

主权项

1. An infra red detector system comprising:
a dual waveband detector having a medium wave (MW) channel, a long wave (LW) channel, and an aperture of a predetermined size, wherein the LW channel and the MW channel have the same pixel size and the size of the aperture imposes an LW diffraction limit on the LW channel of the detector, the dual waveband detector being configured to scan the MW channel such that an image of a target is moved by a portion of a pixel pitch in sequence, said scanning providing an increase in sampling density of the MW channel to ensure that the MW diffraction limit of the aperture is fully utilized by the MW channel in the detector such that more resolved pixels are placed on the target, and said scanning being configured for continuous operation, wherein the dual waveband detector is configured to sample the image in the LW channel at a rate close to a Nyquist limit of the image and under-sample the image in the MW channel.