3D detector noise revisited

摘要

The 3d-noise components are used for describing detector noise, especially for infrared focal-plane array (FPA) detectors, where individual pixel variations and the read-out-process of pixel values will give rise to detector-induced intensity variations. For consistency of actual and anticipated system performance it is essential that detector noise is measured and estimated in a way that is consistent with how noise is modeled in system simulations. This paper describes how to efficiently obtain bias-free estimates of the 3d-noise components in the frequency domain. Frequency domain representation of the noise also allows application-tailored detector noise requirements. Intensity variations caused by e.g. optics should not be allowed to influence the detector noise estimation, frequency domain estimation can easily avoid influence from such non-uniformity. An alternative approach is to use pre-filtering as a means to suppress non-uniformity; the effect of filter choice on estimated 3d-detector noise values is examined and filter choice discussed. Finally, we demonstrate that low pixel operability, requiring replacement by interpolation from neighboring pixels for many of the pixels in the array, will lead to under-estimation of the detector noise of the operable pixels.