A technique for providing apochromatic correction in the wavelength range from 3 to 12 μm, which makes it possible to substantiate the choice of materials and optical powers in an optical system with components separated by an air gap, is discussed. Using numerical methods, it is shown that the solutions found can serve as starting systems for the development of dual-band lenses that provide a stable position of the image plane in the ranges of 3-5 and 8-12 μm, coupled with uncooled dual-band infrared detectors. The results are illustrated by the calculation of a dual-band infrared lens with a focal length of 50 mm and a relative aperture of 1:1.2.
Numerical simulations of longitudinal chromatic aberration in a four-component LWIR continuous zoom lens coupled to an uncooled detector are presented. The results have shown that in schemes containing two optical materials, most solutions involve the outer components made of germanium and the inner components made of materials with lower dispersion coefficients (chalcogenide glasses). The results are confirmed by the developed lens with a zoom ratio of 5X.
In this paper a structural scheme of a telecentric lens for a thermal imaging camera without a protective case allowing to carry out a passive athermalization when the operating temperature changes in the atmosphere is proposed. The relationship between the parameters of lenses and the characteristics of materials, which make it possible to limit the number of materials to two, has been found. It is shown that the requirement for the temperature coefficient of linear expansion of the device case material is determined by the thermo-optical constants and the coefficients of the average dispersion of the lens materials. The results of the development of an athermalized objective lens having a relative aperture equal to f /1 are presented.
The evaluation of performance of the optical electronic devices on object recognition range with the transition from visible range to short-wave (SWIR) range is given. It is caused by the increase of contrast between objects and background. The prototype of optical electronic device that performs image formation in short-wave range (0.9-1.7 μm) of electromagnetic waves is developed and produced. Matrix photodetector based on the InGaAs elements is used as the radiation receiver; the special lenses with angular field 9° on diagonal is developed. The results of the devices‟ test with laboratory and field conditions have confirmed the diffraction image quality, which is formed by the lenses in a specified spectral range, as well as has shown the increase of the object recognition range in a daytime condition by 25% in comparison with expected object recognition range for the visible spectral range.
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