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High-performance nonuniformity correction hard- and software for FPA modules at AIM

Several new 2D detection modules have expanded the family of focal plane arrays (FPA) at AEG IR-Modules GmbH (AIM) recently. Large quantum well (QWIP) and mercury cadmium telluride (MCT) devices, e.g. a 512 X 640 QWIP long wave (LWIR) module, were introduce. These devices provide high thermal resolution with typical noise equivalent temperature differences (NETD) below 25mK. In this performance range the residual spatial noise after non-uniformity correction is often the limiting noise source and more sophisticated correction algorithms than a two-point correction are necessary for a temporal noise limited operation. AIM has developed a self-adaptive iterative correction algorithm to fit these requirements. Its scene based approach eliminates the need of a calibration procedure with thermal references. This algorithm is implemented on AIM's standard video image processing unit VIP-ICM80 running with a maximum frame rate of 50 Hz with 256 X 256 pixels image size. Larger image sizes and higher frame rates of the new AIM detection modules leaded to a new designed video image processing board. This board also provides a microscanner interface to improve geometrical resolution of staring IR imaging modules. The implementation of non-uniformity correction in hard- and software for AIM's 2D detection modules is discussed together with measured performance data concerning the correctability of the devices.