The design of far infrared phase-shifting Twyman-Green interferometer is described in this paper. An IR interferometric method is used to evaluate the surface roughness of ground glass. It is conducted that a rigorous mathematical analysis to describe the contrast of the interference fringes patterns and surface roughness. The experiment is run at the instrument of self-developed interferometer which aperture is Φ 30mm with accuracy better than λ/50 (λ=10.6μm). The mathematical derivation is verified with experimental data obtained from various values of roughness.
Image-intensification has been improved constantly by enhancing the gains of image-intensification more and more, to achieve more sensitive imaging at low light-level. When the sensitivity needs for night vision have been satisfied, further improvement should be the enhancement of night vision image information quantity. On the basis of analysis of information transfer of an image-intensification system, this paper shows that the image transfer from the output screen of the intensifier to eye makes up limitation to the whole system information quantity, and proposes that color image-intensification utilizing spectral gate and color assignment, in the case of that the gain redundancy of image intensifier can compensate adequately spectral gate attenuation, will realize larger information quantity than conventional image-intensification. Then, give out a color image-intensifier scheme combining time-shared photocathode and spatial multiplexed screen.
In this paper according to the property of IR thermal imaging system, we deduce the IR image simulator display hardware and software that used in IR image drive design principles from the equivalent condition of space, time and spectrum distribution of scene IR radiation. Utilizing this design principle, we may get IR image display drive amend method that uses same IR scene image to model different weather and thermal imaging system condition.
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