By Richard H. Vollmerhausen
Advancing expertise in detector arrays, flat panel screens, and electronic photo processing presents new possibilities to extend imaging functions and improve process functionality. Technical managers and layout engineers are confronted with comparing the associated fee, weight, and function of an ever-expanding number of expertise concepts. This instructional textual content offers the idea, methods, and data essential to evaluation and evaluate the functionality of obtainable imaging applied sciences. half I updates the sooner paintings awarded in Analysis of Sampled Imaging platforms (2000). half II discusses functionality overview of electro-optical imagers. half III presents laptop courses (on a supplemental CD-ROM) and updated info on detector arrays, optics, and show ideas.
The booklet covers quite a few reveal codecs and interfaces, and gives unique details on to be had focal aircraft arrays (FPAs). specific emphasis is put on conception and perform for the big variety of accessible infrared FPAs. applied sciences represented contain InSb, HgCdTe, QWIP, and uncooled thermal arrays. info is supplied at the quantum potency, blur, crosstalk, and noise features of every know-how. The detector and array dimensions of obtainable FPAs are supplied. the data on optics, demonstrate, and FPA subassemblies permits the version consumer to make fast and sensible functionality exams of electro-optical imager designs
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Extra info for Analysis and evaluation of sampled imaging systems
In general, the ideal is easier to achieve in the LWIR than in the MWIR because surface errors are a smaller fraction of wavelength. For most optical designs, the ideal is easier to achieve on axis than off axis. Approaching the ideal is easier for large f/#s and smaller fields of view. The thermal program allows the user to input optics MTF if it is available. Also, the user can select ideal, good, or typical. The MTF used by the program in each case is shown in Figs. 2 and given by Eqs. 3). Perhaps the best use of the typical, good, and ideal inputs is to run the program once using each option in order to understand the importance of the optical MTF in establishing overall imager resolution.
3 The display as a filter of the sampled image A different and more useful expression for the Fourier transform is found by starting with Eq. 14). The new expression for G() does not involve the sample values. In all of the above sampling examples, the x = 0 origin is the first sample point. The function f(x) is defined as the intensity distribution starting at the origin. The function f(x) is simply whichever spatial distribution is being sampled. The above expressions for g(x) and G() do not lack generality because, in those expressions, f(x) is only known by its sample values.
Broadband imagers operating in the visible, NIR, and SWIR do not achieve diffraction-limited performance. 2 provides MTF estimates for objective lenses operating in the NIR and SWIR spectral bands. 1 Thermal imagers This section provides suggestions for modeling a thermal objective lens. Diffraction-limited performance is sometimes a realistic assumption. The computer model allows the user to easily select other options. This section describes those options and their applicability. When designing thermal objectives, a number of factors must be considered.