The spatial resolution of millimeter wave (MMW), submillimeter wave (SMMW) and infrared (IR) quasi-optical imagers based on the usage of focal plane antenna arrays (FPAA) is limited by several common factors. Analytical expressions for the point spread functions (PSF) of FPAA imagers are derived for both coherent and spatially incoherent imaging. The possibility of developing advanced super-resolution imaging algorithms using PSFs determined to a high accuracy is discussed.
Electron-optical image converters (EOIC) have been known to be useful in recording and investigating high-speed processes, nuclear physics experiments, automatic environmental control, medicine etc. In this paper the cathode ray tubes with the cathodoluminescent screen having a sufficiently high level of the radiation temporal coherence (particularly on the basis of rare-earth phosphors) are proposed to be utilized as devices for the dynamic data input into the holographic correlator for realization of TV signal recognition in real time. This approach allows combining both the radiation source and the spatial light modulator functions in one compact device.
Theoretical and experimental analysis of factors limiting the quality of images being obtained by means of active coherence millimeter wave quasioptical imaging systems is carried out. Advantages of millimeter wave imaging based either on the artificial destruction of the quasimonochromatic radiation spatial coherence or on the proper choice of a temporal frequency spectrum composition of the spatially coherent radiation were theoretically and experimentally revealed. Two types of receiver arrays were applied to realize millimeter wave imaging.